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A171027 In the sequence of prime numbers, replace all the '5' digits with '4' and vice versa. 3
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 (list; graph; refs; listen; history; text; internal format)
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: A102282 A232543 A279071 * A064933 A060731 A238492

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

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Last modified November 27 07:28 EST 2021. Contains 349365 sequences. (Running on oeis4.)