A243529 Prime numbers containing the string 12.

127, 1123, 1129, 1201, 1213, 1217, 1223, 1229, 1231, 1237, 1249, 1259, 1277, 1279, 1283, 1289, 1291, 1297, 2129, 3121, 4127, 4129, 6121, 7121, 7127, 7129, 8123, 9127, 11213, 11239, 11243, 11251, 11257, 11261, 11273, 11279, 11287

Offset

1,1

Comments

Subsequence of A208272. [Bruno Berselli, May 06 2015]

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Formula

a(n) ~ n log n. - Charles R Greathouse IV, Jun 20 2014

Mathematica

Select[Prime[Range[2000]], ! StringFreeQ[ToString[#], "12" ] &]

Prog

(PARI) contains(n, k)=my(N=digits(n), K=digits(k)); for(i=0, #N-#K, for(j=1, #K, if(N[i+j]!=K[j], next(2))); return(1)); 0
is(n)=isprime(n) && contains(n, 12) \\ Charles R Greathouse IV, Jun 20 2014

Crossrefs

Cf. similar sequences listed in A257667.

Sequence in context: A038994 A068023 A194257 * A299718 A300339 A189026

Adjacent sequences: A243526 A243527 A243528 * A243530 A243531 A243532

Keyword

nonn,base,less

Author

Vincenzo Librandi, Jun 06 2014

Status

approved