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 A023298 Numbers n such that n remains prime through 3 iterations of function f(x) = 9x + 8. 3
 11, 61, 251, 397, 467, 727, 907, 1747, 1901, 2221, 2617, 3121, 3527, 3581, 4001, 4099, 4211, 4759, 5231, 5717, 6277, 6661, 6689, 7237, 7877, 8117, 8171, 8581, 9371, 9587, 11171, 12457, 12539, 13109, 14221, 15187, 15731, 16069, 16477, 16979, 17117, 17491 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS n, 9*n+8, 81*n+80, 729*n+728 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+8) and IsPrime(81*n+80) and IsPrime(729*n+728)] // Vincenzo Librandi, Aug 04 2010 CROSSREFS Subsequence of A023235 and A023267. Sequence in context: A222408 A001847 A089764 * A320145 A106992 A115565 Adjacent sequences:  A023295 A023296 A023297 * A023299 A023300 A023301 KEYWORD nonn AUTHOR STATUS approved

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Last modified August 19 05:11 EDT 2019. Contains 326109 sequences. (Running on oeis4.)