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Prime = Sqrt of Summed Primes (Posted on 2011-03-06) Difficulty: 3 of 5

No Solution Yet Submitted by brianjn    
Rating: 2.0000 (1 votes)

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re(2): computer solutionS (spoiler)MISSING | Comment 4 of 6 |
(In reply to re: computer solutionS (spoiler)MISSING by Ady TZIDON)

"Several combinations were not listed:  17+19=6*6,  47+53= 10*10,  2+3+5+7+11+13+17+19+23=10*10, & probably some more..."

6 and 10 are not prime numbers, as brianjn explicitly mentioned in the puzzle.

BTW, without that requirement the list would be:

2  23  9        100  10
5  13  4        36  6
13  19  3       49  7
13  37  7       169  13
17  19  2       36  6
37  43  3       121  11
47  53  2       100  10
71  73  2       144  12
73  89  4       324  18
73  103  7      625  25
73  109  9      841  29
137  151  4     576  24
163  197  8     1444  38
181  199  5     961  31
199  229  5     1089  33
227  269  9     2209  47
277  283  3     841  29
283  293  2     576  24
293  337  7     2209  47
313  331  3     961  31
317  349  5     1681  41
433  449  4     1764  42

by changing line 120 to

 120        if Sr*Sr=T  then print FirstPrime;LastPrime;N,T;Sr

rather than

120        if Sr*Sr=T and prmdiv(Sr)=Sr then print FirstPrime;LastPrime;N,T;Sr

Edited on March 7, 2011, 11:25 am
  Posted by Charlie on 2011-03-07 11:23:02

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