A171026 In the sequence of prime numbers, replace all the '5' digits with '3' and vice versa.

2, 5, 3, 7, 11, 15, 17, 19, 25, 29, 51, 57, 41, 45, 47, 35, 39, 61, 67, 71, 75, 79, 85, 89, 97, 101, 105, 107, 109, 115, 127, 151, 157, 159, 149, 131, 137, 165, 167, 175, 179, 181, 191, 195, 197, 199, 211, 225, 227, 229, 255, 259, 241, 231, 237, 265

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[#]/.{5->p, 3->q}/.{p->3, q->5}]&/@Prime[Range[100]] (* Vincenzo Librandi, Apr 07 2013 *)

PARI

a(n)=my(v=[0,1,2,5,4,3,6,7,8,9]);subst(Pol(apply(k->v[k+1], digits(prime(n)))),'x,10) \\ Charles R Greathouse IV, Jul 24 2013