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A163557 Composite numbers such that exactly five distinct permutations of digits give primes. 3

%I #7 Apr 06 2015 03:29:29

%S 1007,1018,1057,1067,1070,1075,1076,1081,1108,1127,1172,1180,1271,

%T 1298,1330,1336,1337,1339,1363,1369,1393,1396,1468,1486,1507,1570,

%U 1576,1633,1639,1648,1670,1675,1684,1696,1700,1705,1706,1712,1750,1756,1760,1765

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

%e 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.

%K easy,nonn,base

%O 1,1

%A _Gil Broussard_, Jul 30 2009

%E Checked by _Zak Seidov_, Jul 01 2009

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Last modified April 24 03:08 EDT 2024. Contains 371918 sequences. (Running on oeis4.)