A171057 In the sequence of prime numbers, replace all the '9' digits with '8' and vice versa.

2, 3, 5, 7, 11, 13, 17, 18, 23, 28, 31, 37, 41, 43, 47, 53, 58, 61, 67, 71, 73, 78, 93, 98, 87, 101, 103, 107, 108, 113, 127, 131, 137, 138, 148, 151, 157, 163, 167, 173, 178, 191, 181, 183, 187, 188, 211, 223, 227, 228, 233, 238, 241, 251, 257, 263

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..10000

Programs

Mathematica

FromDigits[IntegerDigits[#] /. {9 -> p, 8 -> q} /. {p -> 8, q -> 9}] & /@ Prime[Range[60]] (* Vincenzo Librandi, Mar 01 2013, after Harvey P. Dale in similar sequences *)

PARI

a(n)=my(v=[0,1,2,3,4,5,6,7,9,8]);apply(k->v[k+1],digits(prime(n))) \\ Charles R Greathouse IV, Jul 16 2013