A180543 Primes that become a different prime under the mapping 3 <=> 7.

3, 7, 13, 17, 31, 37, 43, 47, 71, 73, 103, 107, 137, 139, 163, 167, 173, 179, 193, 197, 223, 227, 233, 277, 337, 347, 353, 379, 383, 439, 463, 467, 479, 613, 617, 643, 647, 739, 743, 757, 773, 787, 823, 827, 853, 857, 883, 887, 1093, 1097, 1213, 1217, 1321

Offset

1,1

Links

Robert Price, Table of n, a(n) for n = 1..3168

Index to Primes, Primes that become a different prime under some mapping.

Mathematica

fQ[n_] := Block[{id = IntegerDigits@n}, (MemberQ[id, 3] || MemberQ[id, 7]) && PrimeQ[ FromDigits[ id /. {3 -> 7, 7 -> 3}] ]]; Select[ Prime@ Range@ 250, fQ]

Crossrefs

Cf. A171037, A175791, A180517 thru A180559, A175789, A180560, A180561.

Sequence in context: A019403 A045422 A191071 * A218833 A113003 A045423

Adjacent sequences: A180540 A180541 A180542 * A180544 A180545 A180546

Keyword

base,nonn

Author

Zak Seidov and Robert G. Wilson v, Sep 09 2010

Status

approved