A171027 In the sequence of prime numbers, replace all the '5' digits with '4' and vice versa.

2, 3, 4, 7, 11, 13, 17, 19, 23, 29, 31, 37, 51, 53, 57, 43, 49, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 159, 141, 147, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 251, 241, 247, 263

Offset

1,1

Links

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

Mathematica

FromDigits[IntegerDigits[#]/.{5->p, 4->q}/.{p->4, q->5}]&/@Prime[Range[100]] (* Vincenzo Librandi, Apr 07 2013 *)

Prog

(PARI) a(n)=my(v=[0, 1, 2, 3, 5, 4, 6, 7, 8, 9]); subst(Pol(apply(k->v[k+1], digits(prime(n)))), 'x, 10) \\ Charles R Greathouse IV, Jul 24 2013

Crossrefs

Sequence in context: A353178 A232543 A279071 * A348792 A064933 A060731

Adjacent sequences: A171024 A171025 A171026 * A171028 A171029 A171030

Keyword

nonn,base,easy

Author

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

Status

approved