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 A255210 Primes p for which exactly seven bases b with 1 < b < p exist such that p is a base-b Wieferich prime. 8
 103291, 491531, 534851, 804367, 997961, 1026899, 1062427, 1457389, 1550513, 2327629, 2602307, 3093121, 3137257, 3181481, 3412741, 3497381, 3720179, 3814253, 4087301, 4234057, 4891973, 5063087, 5131237, 5194789, 5736611, 6253349, 6903191, 6906469, 6945047 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS p = prime(n) such that A242830(n) = 7. LINKS Table of n, a(n) for n=1..29. R. Fischer, Thema: Fermatquotient B^(P-1) == 1 (mod P^2) Fermatquotienten mit extremen Erst-Basen PROG (PARI) forprime(p=1, , b=2; i=0; while(b < p, if(Mod(b, p^2)^(p-1)==1, i++); b++); if(i==7, print1(p, ", "))) CROSSREFS Cf. A255203, A255204, A255205, A255206, A255207, A255208, A255209. Sequence in context: A250704 A250941 A237572 * A147526 A269218 A237894 Adjacent sequences: A255207 A255208 A255209 * A255211 A255212 A255213 KEYWORD nonn AUTHOR Felix Fröhlich, Mar 07 2015 STATUS approved

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Last modified September 8 08:17 EDT 2024. Contains 375751 sequences. (Running on oeis4.)