A171020 - OEIS

A171020

In the sequence of prime numbers, replace all the '4' digits with '1' and vice versa.

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