A180530 - OEIS

A180530

Primes that become a different prime under the mapping 1 <=> 7.

13, 17, 19, 31, 37, 41, 47, 61, 67, 71, 73, 79, 107, 109, 113, 139, 151, 157, 167, 179, 181, 191, 211, 251, 257, 277, 313, 331, 337, 373, 419, 461, 467, 479, 541, 547, 601, 607, 613, 641, 647, 673, 701, 709, 719, 739, 751, 757, 761, 773, 787, 797, 811, 821

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OFFSET

1,1

LINKS

Robert Price, Table of n, a(n) for n = 1..5649

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

MATHEMATICA

fQ[n_] := Block[{id = IntegerDigits@n}, (MemberQ[id, 1] || MemberQ[id, 7]) && PrimeQ[ FromDigits[ id /. {1 -> 7, 7 -> 1}] ]]; Select[ Prime@ Range@ 150, fQ]

CROSSREFS

Cf. A171035, A175791, A180517 thru A180559, A175789, A180560, A180561.

Sequence in context: A099184 A098095 A249953 * A059500 A104213 A178550

Adjacent sequences: A180527 A180528 A180529 * A180531 A180532 A180533

KEYWORD

base,nonn

AUTHOR

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

STATUS

approved