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 A023356 Primes that remain prime through 5 iterations of the function f(x) = 10x + 3. 1
 10061, 20071, 161093, 200713, 291419, 564979, 600791, 606839, 693079, 1826519, 1876807, 2106407, 2249207, 2471471, 3335369, 3955499, 4542547, 4765609, 4829603, 4955981, 5090507, 5534993, 5866247, 5987921, 6091213, 6399521, 6519613, 6522539 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS p, 10*p+3, 100*p+33, 1000*p+333, 10000*p+3333 and 100000*p+33333 are prime for each term p. - Vincenzo Librandi, Aug 05 2010 LINKS John Cerkan, Table of n, a(n) for n = 1..10000 FORMULA a(n) == 9 (mod 14). - John Cerkan, Aug 26 2016 MATHEMATICA ok5Q[n_]:=And@@PrimeQ/@Rest[NestList[10#+3&, n, 5]]; Select[Prime[ Range[500000]], ok5Q] (* Harvey P. Dale, Mar 28 2011 *) PROG (Magma) [n: n in [1..19000000] | IsPrime(n) and IsPrime(10*n+3) and IsPrime(100*n+33) and IsPrime(1000*n+333) and IsPrime(10000*n+3333) and IsPrime(100000*n+33333)] // Vincenzo Librandi, Aug 05 2010 (PARI) is(n)=isprime(n) && isprime(10*n+3) && isprime(100*n+33) && isprime(1000*n+333) && isprime(10000*n+3333) && isprime(100000*n+33333) \\ Charles R Greathouse IV, Jul 28 2016 CROSSREFS Sequence in context: A223431 A203089 A187113 * A292176 A198484 A252200 Adjacent sequences: A023353 A023354 A023355 * A023357 A023358 A023359 KEYWORD nonn AUTHOR David W. Wilson STATUS approved

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Last modified June 2 00:00 EDT 2023. Contains 363078 sequences. (Running on oeis4.)