

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



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



KEYWORD

easy,nonn,base


AUTHOR



EXTENSIONS



STATUS

approved



