A171044 In the sequence of prime numbers, replace all the '8' digits with '3' and vice versa.

2, 8, 5, 7, 11, 18, 17, 19, 28, 29, 81, 87, 41, 48, 47, 58, 59, 61, 67, 71, 78, 79, 38, 39, 97, 101, 108, 107, 109, 118, 127, 181, 187, 189, 149, 151, 157, 168, 167, 178, 179, 131, 191, 198, 197, 199, 211, 228, 227, 229, 288, 289, 241, 251, 257, 268

Offset: 1

Author

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

Keywords

• nonn
• base
• easy

Links

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

Programs

Mathematica

FromDigits[IntegerDigits[#]/.{8->p, 3->q}/.{p->3, q->8}]&/@Prime[Range[100]] (* Vincenzo Librandi, Mar 11 2013 *)

PARI

a(n)=my(v=[0,1,2,8,4,5,6,7,3,9]);subst(Pol(apply(k->v[k+1], digits(prime(n)))),'x,10) \\ Charles R Greathouse IV, Jul 31 2013