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 A023291 Primes that remain prime through 3 iterations of function f(x) = 8x + 1. 2
 2, 1487, 2207, 2927, 8807, 11117, 16187, 17657, 26357, 44927, 45377, 48497, 91757, 110237, 117167, 122327, 125387, 126107, 145007, 170927, 174527, 190787, 193847, 203897, 230567, 244247, 246017, 270287, 280547, 283937, 347957, 362237, 364337 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Primes p such that 8*p+1, 64*p+9 and 512*p+73 are also primes. - Vincenzo Librandi, Aug 04 2010 LINKS John Cerkan, Table of n, a(n) for n = 1..10000 FORMULA a(n) == 17 (mod 30) for n > 1. - John Cerkan, Sep 23 2016 MATHEMATICA okQ[n_]:=And@@PrimeQ[NestList[8#+1&, n, 3]]; Select[Prime[Range[50000]], okQ] (* Harvey P. Dale, Jan 09 2011 *) PROG (Magma) [n: n in [1..450000] | IsPrime(n) and IsPrime(8*n+1) and IsPrime(64*n+9) and IsPrime(512*n+73)] // Vincenzo Librandi, Aug 04 2010 CROSSREFS Subsequence of A005123, A023228, and A023260. Sequence in context: A374193 A172234 A339543 * A319329 A058423 A233906 Adjacent sequences: A023288 A023289 A023290 * A023292 A023293 A023294 KEYWORD nonn AUTHOR David W. Wilson STATUS approved

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Last modified July 13 17:30 EDT 2024. Contains 374284 sequences. (Running on oeis4.)