A163557 - OEIS

A163557

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

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

(list; graph; refs; listen; history; text; internal format)

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