A163560 Composite numbers such that exactly eight distinct permutations of digits give primes.

1130, 1132, 1139, 1309, 1310, 1312, 1376, 1390, 1391, 1478, 1673, 1736, 1748, 1763, 1784, 1874, 1903, 1930, 2375, 2537, 2573, 2735, 3076, 3091, 3101, 3110, 3112, 3176, 3190, 3211, 3275, 3572, 3670, 3706, 3716, 3725, 3752, 3760, 3901, 3910, 4178, 4187

Offset

1,1

Links

Zak Seidov, Table of n, a(n) for n = 1..4471

Example

a(1) = 1130 because 1130 is composite and 113, 131, 311, 1013, 1031, 1103, 1301, and 3011 are prime permutations, and no other permutation of 1130 is prime.

Crossrefs

Sequence in context: A325087 A261404 A023307 * A252287 A211684 A162023

Adjacent sequences: A163557 A163558 A163559 * A163561 A163562 A163563

Keyword

easy,nonn,base

Author

Gil Broussard, Jul 30 2009

Status

approved