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A023328 Primes that remain prime through 4 iterations of function f(x) = 10x + 3. 1
2, 10061, 11777, 17489, 17839, 19379, 19441, 20071, 21773, 30809, 32069, 36529, 39511, 40973, 45503, 52223, 66943, 83813, 100613, 112213, 120067, 135089, 144427, 151573, 156887, 161093, 164999, 179111, 179497, 185923, 200713, 219943, 227489 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Primes p such that 10*p+3, 100*p+33, 1000*p+333 and 10000*p+3333 are also primes. - Vincenzo Librandi, Aug 04 2010
LINKS
MATHEMATICA
p4iQ[n_]:=And@@PrimeQ[NestList[10#+3&, n, 4]]; Select[Prime[Range[21000]], p4iQ] (* Harvey P. Dale, Oct 02 2012 *)
PROG
(Magma) [n: n in [1..5000000] | IsPrime(n) and IsPrime(10*n+3) and IsPrime(100*n+33) and IsPrime(1000*n+333) and IsPrime(10000*n+3333)] // Vincenzo Librandi, Aug 04 2010
CROSSREFS
Sequence in context: A340546 A343700 A086563 * A294324 A349510 A134656
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified March 28 08:22 EDT 2024. Contains 371236 sequences. (Running on oeis4.)