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A097958
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Primes p such that p divides 6^((p-1)/2) - 3^((p-1)/2).
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2
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3, 7, 17, 23, 31, 41, 47, 71, 73, 79, 89, 97, 103, 113, 127, 137, 151, 167, 191, 193, 199, 223, 233, 239, 241, 257, 263, 271, 281, 311, 313, 337, 353, 359, 367, 383, 401, 409, 431, 433, 439, 449, 457, 463, 479, 487, 503, 521, 569, 577, 593, 599, 601, 607, 617
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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MATHEMATICA
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Select[Prime[Range[150]], Divisible[6^((#-1)/2)-3^((#-1)/2), #]&] (* Harvey P. Dale, Dec 25 2021 *)
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PROG
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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", "))) }
(PARI) isA097958(p) = (p==3) || (isprime(p) && kronecker(p, 2)==1) \\ Jianing Song, Apr 21 2022
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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