A171025 In the sequence of prime numbers, replace all the '5' digits with '2' and vice versa.

5, 3, 2, 7, 11, 13, 17, 19, 53, 59, 31, 37, 41, 43, 47, 23, 29, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 157, 131, 137, 139, 149, 121, 127, 163, 167, 173, 179, 181, 191, 193, 197, 199, 511, 553, 557, 559, 533, 539, 541, 521, 527, 563

Offset

1,1

Links

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

Mathematica

FromDigits[IntegerDigits[#]/.{5->p, 2->q}/.{p->2, q->5}]&/@Prime[Range[100]] (* Vincenzo Librandi, Apr 07 2013 *)

Prog

(PARI) a(n)=my(v=[0, 1, 5, 3, 4, 2, 6, 7, 8, 9]); subst(Pol(apply(k->v[k+1], digits(prime(n)))), 'x, 10) \\ Charles R Greathouse IV, Jul 16 2013

Crossrefs

Sequence in context: A271523 A352903 A125844 * A222362 A352024 A176524

Adjacent sequences: A171022 A171023 A171024 * A171026 A171027 A171028

Keyword

nonn,base,easy

Author

N. J. A. Sloane and Vincenzo Librandi, Sep 04 2010

Status

approved