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 A045473 Primes congruent to 6 mod 7. 12
 13, 41, 83, 97, 139, 167, 181, 223, 251, 293, 307, 349, 419, 433, 461, 503, 587, 601, 643, 727, 769, 797, 811, 839, 853, 881, 937, 1021, 1049, 1063, 1091, 1217, 1231, 1259, 1301, 1399, 1427, 1483, 1511, 1553, 1567, 1609, 1637, 1693, 1721, 1777, 1847, 1861 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Conjecture: Primes p such that ((x+1)^7-1)/x has 3 irreducible factors of degree 2 over GF(p). - Federico Provvedi, Mar 31 2018 Also primes of the form 14*k + 13. - David A. Corneth, Apr 02 2018 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 MAPLE select(n->isprime(n) and modp(n, 7)=6, [\$1..1900]); # Muniru A Asiru, Mar 31 2018 MATHEMATICA Select[Range[6, 1600, 7], PrimeQ] (* Bruno Berselli, Aug 17 2012 *) PROG (Magma) [ p: p in PrimesUpTo(11000) | p mod 7 eq 6 ]; // Vincenzo Librandi, Aug 13 2012 (PARI) is(n)=isprime(n) && n%7==6 \\ Charles R Greathouse IV, Jul 01 2016 (GAP) Filtered([1..1900], n->IsPrime(n) and n mod 7 = 6); # Muniru A Asiru, Mar 31 2018 CROSSREFS Cf. A042988 (complement). Sequence in context: A043162 A043942 A004624 * A102083 A139866 A026918 Adjacent sequences: A045470 A045471 A045472 * A045474 A045475 A045476 KEYWORD nonn,easy AUTHOR N. J. A. Sloane STATUS approved

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Last modified February 27 16:21 EST 2024. Contains 370378 sequences. (Running on oeis4.)