A171036 In the sequence of prime numbers, replace all the '7' digits with '2' and vice versa.

7, 3, 5, 2, 11, 13, 12, 19, 73, 79, 31, 32, 41, 43, 42, 53, 59, 61, 62, 21, 23, 29, 83, 89, 92, 101, 103, 102, 109, 113, 172, 131, 132, 139, 149, 151, 152, 163, 162, 123, 129, 181, 191, 193, 192, 199, 711, 773, 772, 779, 733, 739, 741, 751, 752, 763

Offset

1,1

Links

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

Mathematica

FromDigits[IntegerDigits[#]/.{7->p, 2->q}/.{p->2, q->7}]&/@Prime[Range[100]] (* Vincenzo Librandi, Apr 07 2013 *)

Prog

(PARI) a(n)=my(v=[0, 1, 7, 3, 4, 5, 6, 2, 8, 9]); subst(Pol(apply(k->v[k+1], digits(prime(n)))), 'x, 10) \\ Charles R Greathouse IV, Jul 25 2013

Crossrefs

Sequence in context: A011476 A231190 A021140 * A351729 A304658 A253298

Adjacent sequences: A171033 A171034 A171035 * A171037 A171038 A171039

Keyword

nonn,base,easy

Author

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

Status

approved