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## #101 2014-02-08 19:28:17

mathaholic
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From: idk
Registered: 2012-11-29
Posts: 2,905
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### Re: Prime Number Challenges

Okay.

69. p1+c2+p3...+c100=?

70. Is it prime?

I will have a name change soon. By the way, welcome to the Philippines, Pope Francis!

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## #102 2014-02-08 22:44:55

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 92,964

### Re: Prime Number Challenges

In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

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## #103 2014-02-10 21:15:27

mathaholic
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From: idk
Registered: 2012-11-29
Posts: 2,905
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### Re: Prime Number Challenges

Okay.

71. p47 - p46
72. p38 / p27

I will have a name change soon. By the way, welcome to the Philippines, Pope Francis!

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## #104 2014-02-10 22:59:01

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 92,964

### Re: Prime Number Challenges

Hi;

In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

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## #105 2014-02-12 21:18:01

mathaholic
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From: idk
Registered: 2012-11-29
Posts: 2,905
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### Re: Prime Number Challenges

73. p2^2
74. add the digits of #73

I will have a name change soon. By the way, welcome to the Philippines, Pope Francis!

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## #106 2014-02-12 23:02:46

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 92,964

### Re: Prime Number Challenges

In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

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## #107 2014-05-18 12:45:05

mathaholic
Member
From: idk
Registered: 2012-11-29
Posts: 2,905
Website

### Re: Prime Number Challenges

Correct!

# 75 squared

# 76 cubed

# 77 (sum of digits of #75) cubed

# 78 (sum of #76 and #77) raise to the fifth power

# 79 (sum of digits of #78) squared

# 80 Is (sum of digits of #75-79) prime?

I will have a name change soon. By the way, welcome to the Philippines, Pope Francis!

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## #108 2014-05-18 12:59:39

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 92,964

### Re: Prime Number Challenges

In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

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## #109 2014-05-18 13:25:19

mathaholic
Member
From: idk
Registered: 2012-11-29
Posts: 2,905
Website

### Re: Prime Number Challenges

# 81. to the four

# 82. prime?

I will have a name change soon. By the way, welcome to the Philippines, Pope Francis!

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## #110 2014-05-18 13:28:18

ShivamS
Member
Registered: 2011-02-07
Posts: 3,640

### Re: Prime Number Challenges

Can you explain these a bit? I do not understand the questions.

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## #111 2014-05-18 13:32:36

mathaholic
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From: idk
Registered: 2012-11-29
Posts: 2,905
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### Re: Prime Number Challenges

Okay. I'm sorry, but:

#81. What is 81^4?

#82. Is (Sum of digits of 81^4) prime?

I will have a name change soon. By the way, welcome to the Philippines, Pope Francis!

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## #112 2014-05-18 13:36:26

ShivamS
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Registered: 2011-02-07
Posts: 3,640

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## #113 2014-05-18 13:40:38

mathaholic
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From: idk
Registered: 2012-11-29
Posts: 2,905
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### Re: Prime Number Challenges

I mean sum of digits, like 4+3+0+4+6+7+2+1. Anyways, nice try!

I'll write the items more user friendly.

83. What is 3 to the 5?
84. Multiply that answer by itself.
85. Multiply it by the nth prime (let n be the answer to #83).

I will have a name change soon. By the way, welcome to the Philippines, Pope Francis!

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## #114 2014-05-18 13:43:15

ShivamS
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Registered: 2011-02-07
Posts: 3,640

### Re: Prime Number Challenges

I missed the sum part, sorry. The question you asked in the last post was clear enough, thanks.

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## #115 2014-05-18 13:43:59

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 92,964

### Re: Prime Number Challenges

Hi;

In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

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## #116 2014-05-18 13:45:21

ShivamS
Member
Registered: 2011-02-07
Posts: 3,640

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## #117 2014-05-18 13:47:30

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 92,964

### Re: Prime Number Challenges

Sorry, latex error.

In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

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## #118 2014-05-18 14:01:31

mathaholic
Member
From: idk
Registered: 2012-11-29
Posts: 2,905
Website

### Re: Prime Number Challenges

It's okay. Time to sharpen our minds!

#86. 1+2+4+8+1+6+3+2+6+4+1+2+8...+1+0+4+8+5+7+6
#87. 1+3+9+2+7+8+1+2+4+3+7+2+9...+3+8+7+4+2+0+4+8+9
#88. 1+5+2+5+1+2+5+6+2+5+3+1+2+5...+9+7+6+5+6+2+5

Note: Give me the pattern first before the sum. Both in separate posts.

#89. Sum of digits of #86-88.

After solving for the sum of 86, 87 and 88, respectively, answer this in a separate post, again.

Last edited by mathaholic (2014-05-18 14:02:41)

I will have a name change soon. By the way, welcome to the Philippines, Pope Francis!

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## #119 2014-05-27 22:33:50

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 92,964

### Re: Prime Number Challenges

Hi;

I do not understand the questions please explain.

In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

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## #120 2014-05-28 01:27:26

ShivamS
Member
Registered: 2011-02-07
Posts: 3,640

### Re: Prime Number Challenges

Last edited by ShivamS (2014-05-28 01:27:46)

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## #121 2014-05-28 12:35:02

mathaholic
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From: idk
Registered: 2012-11-29
Posts: 2,905
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### Re: Prime Number Challenges

Hmm, since I'm too lazy to check...

#90. What is the square root of 121?

#91. It's obvious that it's prime. But, does the sum of its digits equal a prime number, too?

I will have a name change soon. By the way, welcome to the Philippines, Pope Francis!

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## #122 2014-05-28 12:57:52

ShivamS
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Registered: 2011-02-07
Posts: 3,640

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## #123 2014-05-28 13:47:44

mathaholic
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From: idk
Registered: 2012-11-29
Posts: 2,905
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### Re: Prime Number Challenges

Whoops, I forgot to specify:

#91. Does the sum of the digits of the answer in #90 prime?

I will have a name change soon. By the way, welcome to the Philippines, Pope Francis!

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## #124 2014-05-28 13:49:42

ShivamS
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Registered: 2011-02-07
Posts: 3,640

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## #125 2014-05-28 19:28:55

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 92,964

### Re: Prime Number Challenges

Hi;

Should be #92

In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

Offline