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 A023297 Numbers n such that n remains prime through 3 iterations of function f(x) = 9x + 4. 3
 3, 31, 37, 41, 107, 421, 773, 967, 1451, 1567, 1571, 1637, 1973, 3011, 3793, 4111, 4217, 4703, 5783, 6961, 7331, 8443, 8627, 9323, 10733, 12071, 12413, 12721, 12967, 13523, 14107, 14503, 14737, 15647, 17851, 17881, 19853, 19991, 20051, 20233, 22157, 23291 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS n, 9*n+4, 81*n+40 and 729*n+364 are primes. - Vincenzo Librandi, Aug 04 2010 LINKS John Cerkan, Table of n, a(n) for n = 1..10000 PROG (MAGMA) [n: n in [1..450000] | IsPrime(n) and IsPrime(9*n+4) and IsPrime(81*n+40) and IsPrime(729*n+364)] // Vincenzo Librandi, Aug 04 2010 CROSSREFS Subsequence of A023234 and A023266. Sequence in context: A139090 A238197 A042477 * A077546 A168274 A141177 Adjacent sequences:  A023294 A023295 A023296 * A023298 A023299 A023300 KEYWORD nonn AUTHOR STATUS approved

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Last modified July 23 01:52 EDT 2019. Contains 325228 sequences. (Running on oeis4.)