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A160044 Nonnegative integers x such that x^y+y^x is not prime for any integer y>1, y<x. +0
2
0, 1, 2, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14, 16, 17, 18, 19, 20, 22, 23, 25, 26, 27, 28, 29, 30, 31, 34, 35, 36, 37, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 55, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 70, 71, 72, 73, 74, 77, 78, 79, 80, 82, 83, 84, 85, 86 (list; graph; listen)
OFFSET

1,3

COMMENT

This lists the nonnegative integers not occurring in A162486, i.e. the complement of A162488.

See A094133 for more information, links and references.

PROGRAM

(PARI) for( i=0, 999, for( j=2, i-1, is/*pseudo*/prime(i^j+j^i) && next(2)); print1(i", "))

CROSSREFS

Cf. A094133, A162486 - A162490.

Sequence in context: A139143 A047263 A039244 this_sequence A127428 A039187 A001963

Adjacent sequences: A160041 A160042 A160043 this_sequence A160045 A160046 A160047

KEYWORD

nonn

AUTHOR

M. F. Hasler (MHasler(AT)univ-ag.fr), Jul 04 2009

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Last modified March 20 09:10 EDT 2010. Contains 173642 sequences.


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