

A163557


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


3



1007, 1018, 1057, 1067, 1070, 1075, 1076, 1081, 1108, 1127, 1172, 1180, 1271, 1298, 1330, 1336, 1337, 1339, 1363, 1369, 1393, 1396, 1468, 1486, 1507, 1570, 1576, 1633, 1639, 1648, 1670, 1675, 1684, 1696, 1700, 1705, 1706, 1712, 1750, 1756, 1760, 1765
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..42.


EXAMPLE

a(1) = 1007 because 1007 is composite, the five permutations 17, 71, 107, 701, and 7001 are all prime, and no other permutation of 1007 is prime.


CROSSREFS

Sequence in context: A202147 A252417 A067918 * A241932 A160451 A254973
Adjacent sequences: A163554 A163555 A163556 * A163558 A163559 A163560


KEYWORD

easy,nonn,base


AUTHOR

Gil Broussard, Jul 30 2009


EXTENSIONS

Checked by Zak Seidov, Jul 01 2009


STATUS

approved



