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 A160044 Nonnegative integers x such that x^y+y^x is not prime for any integer y>1, y
 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; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS This lists the nonnegative integers not occurring in A162486, i.e. the complement of A162488. See A094133 for more information, links and references. LINKS PROG (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: A184528 A047263 A039244 * A180917 A127428 A039187 Adjacent sequences:  A160041 A160042 A160043 * A160045 A160046 A160047 KEYWORD nonn AUTHOR M. F. Hasler, Jul 04 2009 STATUS approved

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Last modified January 21 13:55 EST 2020. Contains 331113 sequences. (Running on oeis4.)