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A171020 In the sequence of prime numbers, replace all the '4' digits with '1' and vice versa. 3
2, 3, 5, 7, 44, 43, 47, 49, 23, 29, 34, 37, 14, 13, 17, 53, 59, 64, 67, 74, 73, 79, 83, 89, 97, 404, 403, 407, 409, 443, 427, 434, 437, 439, 419, 454, 457, 463, 467, 473, 479, 484, 494, 493, 497, 499, 244, 223, 227, 229, 233, 239, 214, 254, 257, 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[#]/.{4->p, 1->q}/.{p->1, q->4}]&/@Prime[Range[100]] (* Vincenzo Librandi, Apr 07 2013 *)

PROG

(PARI) a(n)=my(v=[0, 4, 2, 3, 1, 5, 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: A223035 A096843 A052016 * A214179 A178237 A118842

Adjacent sequences:  A171017 A171018 A171019 * A171021 A171022 A171023

KEYWORD

nonn,base,easy

AUTHOR

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

STATUS

approved

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Last modified August 4 13:24 EDT 2020. Contains 336201 sequences. (Running on oeis4.)