A171035 In the sequence of prime numbers, replace all the '7' digits with '1' and vice versa.

2, 3, 5, 1, 77, 73, 71, 79, 23, 29, 37, 31, 47, 43, 41, 53, 59, 67, 61, 17, 13, 19, 83, 89, 91, 707, 703, 701, 709, 773, 721, 737, 731, 739, 749, 757, 751, 763, 761, 713, 719, 787, 797, 793, 791, 799, 277, 223, 221, 229, 233, 239, 247, 257, 251, 263

Offset

1,1

Links

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

Mathematica

FromDigits[IntegerDigits[#]/.{7->p, 1->q}/.{p->1, q->7}]&/@Prime[Range[100]] (* Vincenzo Librandi, Apr 07 2013 *)

Prog

(PARI) a(n)=my(v=[0, 7, 2, 3, 4, 5, 6, 1, 8, 9]); subst(Pol(apply(k->v[k+1], digits(prime(n)))), 'x, 10) \\ Charles R Greathouse IV, Jul 25 2013

Crossrefs

Sequence in context: A178763 A111141 A069111 * A094122 A280185 A369060

Adjacent sequences: A171032 A171033 A171034 * A171036 A171037 A171038

Keyword

nonn,base,easy

Author

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

Status

approved