id:A055386 - OEIS Search Results

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Smallest factor of (2n)^(2n) + 1.

+0
3

5, 257, 13, 97, 101, 89, 29, 274177, 5, 148721, 5, 17, 53, 449, 17, 641, 13, 17, 5, 17, 5, 41, 29, 769, 41, 89, 13, 17, 5, 17, 5, 59649589127497217, 37, 41, 13, 97, 149, 17, 5, 15361, 5, 1753, 13, 17, 41, 449, 1129, 1153, 5, 17, 5, 1201, 17, 1777, 89, 4993, 41 (list; graph; listen)

	OFFSET	`1,1`
	REFERENCES	`C. Stanley Ogilvy and John T. Anderson, Excursions in Number Theory. Dover. New York: 1988. Page 82.`
	LINKS	`Is there any value of n other than 1, 2, and 4, such that n^n+1 is a prime?`
	EXAMPLE	`8^8 + 1 = 97 * 257 * 673, so a(4) = 97.`
	CROSSREFS	`Cf. A014566, A055385.` `Sequence in context: A060943 A002770 A069071 this_sequence A139000 A061959 A002554` `Adjacent sequences: A055383 A055384 A055385 this_sequence A055387 A055388 A055389`
	KEYWORD	`nonn`
	AUTHOR	`Walter Nissen (wnissen(AT)tfn.net), Jun 24 2000`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

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