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Search: id:A161402
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| A161402 |
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Numbers n such that the count of primes among the permutations of the digits of n is greater than 2. |
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+0
1
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| 103, 107, 113, 130, 131, 136, 137, 149, 157, 163, 167, 170, 173, 175, 176, 179, 194, 197, 199, 301, 307, 310, 311, 316, 317, 337, 359, 361, 370, 371, 373, 379, 389, 395, 397, 398, 419, 491, 517, 539, 571, 593, 613, 617, 631, 671, 701, 703, 709, 710, 713
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Leading zeros in the permutations are ignored.
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LINKS
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C. Hilliard, Comments and PARI program.
Wikipedia,Permutation
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EXAMPLE
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103 has three permutations of its digits 1, 0, 3 that form a prime, namely 103, 031, 013. So the count of primes for 103 is greater than 2 and 103 is in the sequence.
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PROGRAM
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(PARI) Cf. C. Hilliard link.
(MAGMA) [ n: n in [1..720] | #[ s: s in Seqset([ Seqint([m(p[i]):i in [1..#x] ], 10): p in Permutations(Seqset(x)) ]) | IsPrime(s) ] gt 2 where m is map< x->y | [<x[i], y[i]>:i in [1..#x] ] > where x is [1..#y] where y is Intseq(n, 10) ]; [From Klaus Brockhaus, Jun 14 2009]
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CROSSREFS
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Sequence in context: A129751 A094095 A074675 this_sequence A165294 A046076 A144714
Adjacent sequences: A161399 A161400 A161401 this_sequence A161403 A161404 A161405
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KEYWORD
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base,nonn
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AUTHOR
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Cino Hilliard (hillcino368(AT)hotmail.com), Jun 09 2009
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EXTENSIONS
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Edited by Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Jun 14 2009
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