A171039 In the sequence of prime numbers, replace all the '7' digits with '5' and vice versa.

2, 3, 7, 5, 11, 13, 15, 19, 23, 29, 31, 35, 41, 43, 45, 73, 79, 61, 65, 51, 53, 59, 83, 89, 95, 101, 103, 105, 109, 113, 125, 131, 135, 139, 149, 171, 175, 163, 165, 153, 159, 181, 191, 193, 195, 199, 211, 223, 225, 229, 233, 239, 241, 271, 275, 263

Offset

1,1

Links

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

Mathematica

pq[n_]:=Module[{idn=IntegerDigits[n]}, FromDigits[idn/. {7->p, 5->q}/. {p->5, q->7}]]; pq/@Prime[Range[60]]  (* Harvey P. Dale, Apr 04 2011 *)

Prog

(PARI) a(n)=my(v=[0, 1, 2, 3, 4, 7, 6, 5, 8, 9]); subst(Pol(apply(k->v[k+1], digits(prime(n)))), 'x, 10) \\ Charles R Greathouse IV, Jul 26 2013

Crossrefs

Sequence in context: A087387 A275205 A327093 * A063904 A297929 A221858

Adjacent sequences: A171036 A171037 A171038 * A171040 A171041 A171042

Keyword

nonn,base,easy

Author

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

Status

approved