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Search: id:A097955
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| A097955 |
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Primes p such that p divides 5^(p-1)/2 - 2^(p-1)/2. |
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+0
1
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| 3, 13, 31, 37, 41, 43, 53, 67, 71, 79, 83, 89, 107, 151, 157, 163, 173, 191, 197, 199, 227, 239, 241, 271, 277, 281, 283, 293, 307, 311, 317, 347, 359, 373, 397, 401, 409, 431, 439, 443, 449, 467, 479, 521, 523, 547, 557, 563, 569, 587, 599, 601, 613, 631, 641
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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5^6-2^6 = 3^2*7*13*19
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PROGRAM
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(PARI) \s = +-1, d=diff ptopm1d2(n, x, d, s) = { forprime(p=3, n, p2=(p-1)/2; y=x^p2 + s*(x-d)^p2; if(y%p==0, print1(p", "))) }
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CROSSREFS
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Sequence in context: A154300 A051805 A022264 this_sequence A077717 A145907 A054554
Adjacent sequences: A097952 A097953 A097954 this_sequence A097956 A097957 A097958
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KEYWORD
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nonn
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AUTHOR
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Cino Hilliard (hillcino368(AT)gmail.com), Sep 06 2004
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