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 A023265 Numbers n such that n remains prime through 2 iterations of function f(x) = 9x + 2. 1
 3, 11, 19, 31, 103, 109, 113, 131, 151, 173, 179, 239, 283, 313, 491, 521, 599, 619, 733, 739, 773, 929, 1019, 1103, 1361, 1439, 1481, 1621, 1709, 1741, 1831, 1993, 2083, 2153, 2293, 2411, 2549, 2551, 2593, 2689, 2741, 2819, 2843, 2969, 3001, 3623, 3931, 4001 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS n, 9*n+2 and 81*n+20 are primes. [From Vincenzo Librandi, Aug 04 2010] LINKS PROG (MAGMA) [n: n in [1..100000] | IsPrime(n) and IsPrime(9*n+2) and IsPrime(81*n+20)] [From Vincenzo Librandi, Aug 04 2010] CROSSREFS Sequence in context: A175122 A031369 A014223 * A018557 A213540 A085616 Adjacent sequences:  A023262 A023263 A023264 * A023266 A023267 A023268 KEYWORD nonn AUTHOR STATUS approved

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Last modified May 24 22:42 EDT 2013. Contains 225631 sequences.