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 A087759 Primes p such that 7^p - 6^p is composite. 1
 5, 11, 13, 17, 19, 23, 31, 37, 43, 47, 53, 59, 61, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,1 LINKS MATHEMATICA Select[Prime[Range[70]], CompositeQ[7^#-6^#]&] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Mar 12 2019 *) PROG (PARI) apmb(a, b, n) = { forprime(x=2, n, y=a^x-b^x; if(!ispseudoprime(y), print1(x", "); ) ) } CROSSREFS Cf. A016169. Sequence in context: A082554 A141246 A288445 * A234644 A299791 A230359 Adjacent sequences:  A087756 A087757 A087758 * A087760 A087761 A087762 KEYWORD nonn AUTHOR Cino Hilliard, Oct 26 2003 STATUS approved

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Last modified September 24 17:33 EDT 2021. Contains 347651 sequences. (Running on oeis4.)