A171037 In the sequence of prime numbers, replace all the '7' digits with '3' and vice versa.

2, 7, 5, 3, 11, 17, 13, 19, 27, 29, 71, 73, 41, 47, 43, 57, 59, 61, 63, 31, 37, 39, 87, 89, 93, 101, 107, 103, 109, 117, 123, 171, 173, 179, 149, 151, 153, 167, 163, 137, 139, 181, 191, 197, 193, 199, 211, 227, 223, 229, 277, 279, 241, 251, 253, 267

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, 3->q}/.{p->3, q->7}]]; pq/@Prime[Range[60]] (* Harvey P. Dale, Dec 11 2012 *)

Prog

(PARI) a(n)=my(v=[0, 1, 2, 7, 4, 5, 6, 3, 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: A272699 A138344 A354633 * A246205 A340117 A160669

Adjacent sequences: A171034 A171035 A171036 * A171038 A171039 A171040

Keyword

nonn,base,easy

Author

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

Status

approved