id:A075469 - OEIS Search Results

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Maximal m such that n^n-m and n^n+m are both primes, or -1 if there is no such m.

+0
2

1, 20, 253, 3122, 46651, 823540, 16777155, 387420478, 9999999939, 285311670528, 8916100448227, 302875106592216, 11112006825558003, 437893890380859368, 18446744073709551537, 827240261886336764070, 39346408075296537575383 (list; graph; listen)

	OFFSET	`2,2`
	COMMENT	`Are there any negative terms?`
	EXAMPLE	`a(4) = 253 since 4^4-253 = 3 and 4^4+253 = 509 are both prime.`
	CROSSREFS	`Cf. A075468.` `Sequence in context: A055757 A022744 A081143 this_sequence A028032 A025986 A028027` `Adjacent sequences: A075466 A075467 A075468 this_sequence A075470 A075471 A075472`
	KEYWORD	`nonn`
	AUTHOR	`Lior Manor (lior.manor(AT)gmail.com) Sep 18 2002`

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Last modified November 24 14:25 EST 2009. Contains 167438 sequences.

AT&T Labs Research