

A178033


Lesser of a twin prime pair (p,p+2) such that permuting the digits of p and those of p+2 gives a different twin prime pair (q, q+2).


0



281, 461, 641, 821, 1031, 1091, 1229, 1277, 1301, 1319, 1427, 1697, 1721, 1787, 1877, 2081, 2129, 2381, 2687, 2711, 2801, 3119, 3251, 3257, 3371, 3467, 3527, 3581, 3821, 3851, 4091, 4127, 4157, 4217
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OFFSET

1,1


COMMENTS

Permutations with initial zeros are disallowed, so that 101 is not a member (101,103 and 11,13); equivalently, we require that p is a permutation of the digits of q as well.


LINKS

Table of n, a(n) for n=1..34.


EXAMPLE

281 is a member as 281 is the lesser of the twin prime pair 281,283, and after permuting 821, 823 is also a twin prime pair.


CROSSREFS

Cf. A001359, A172271, A172494, A173255, A174454
Sequence in context: A142444 A139655 A161190 * A098677 A056215 A142397
Adjacent sequences: A178030 A178031 A178032 * A178034 A178035 A178036


KEYWORD

nonn,base


AUTHOR

Ulrich Krug (leuchtfeuer37(AT)gmx.de), May 17 2010


EXTENSIONS

Corrected and edited by D. S. McNeil, Nov 23 2010


STATUS

approved



