A171030 - OEIS

A171030

In the sequence of prime numbers, replace all the '6' digits with '2' and vice versa.

6, 3, 5, 7, 11, 13, 17, 19, 63, 69, 31, 37, 41, 43, 47, 53, 59, 21, 27, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 167, 131, 137, 139, 149, 151, 157, 123, 127, 173, 179, 181, 191, 193, 197, 199, 611, 663, 667, 669, 633, 639, 641, 651, 657, 623

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OFFSET

1,1

LINKS

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

MATHEMATICA

FromDigits[IntegerDigits[#]/.{6->p, 2->q}/.{p->2, q->6}]&/@Prime[Range[100]] (* Vincenzo Librandi, Apr 07 2013 *)

PROG

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

CROSSREFS

Sequence in context: A199728 A373548 A199867 * A294386 A217769 A296501

Adjacent sequences: A171027 A171028 A171029 * A171031 A171032 A171033

KEYWORD

nonn,base,easy

AUTHOR

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

STATUS

approved