A171054 - OEIS

A171054

In the sequence of prime numbers, replace all the '9' digits with '5' and vice versa.

2, 3, 9, 7, 11, 13, 17, 15, 23, 25, 31, 37, 41, 43, 47, 93, 95, 61, 67, 71, 73, 75, 83, 85, 57, 101, 103, 107, 105, 113, 127, 131, 137, 135, 145, 191, 197, 163, 167, 173, 175, 181, 151, 153, 157, 155, 211, 223, 227, 225, 233, 235, 241, 291, 297, 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[#] /. {9 -> p, 5 -> q} /. {p -> 5, q -> 9}] & /@ Prime[Range[100]] (* Vincenzo Librandi, Apr 07 2013 *)

PROG

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

CROSSREFS

Sequence in context: A199963 A016634 A244257 * A205860 A318948 A328424

Adjacent sequences: A171051 A171052 A171053 * A171055 A171056 A171057

KEYWORD

nonn,base,easy

AUTHOR

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

STATUS

approved