A055385 - OEIS

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A055385

Smallest factor of n^n + 1.

2, 5, 2, 257, 2, 13, 2, 97, 2, 101, 2, 89, 2, 29, 2, 274177, 2, 5, 2, 148721, 2, 5, 2, 17, 2, 53, 2, 449, 2, 17, 2, 641, 2, 13, 2, 17, 2, 5, 2, 17, 2, 5, 2, 41, 2, 29, 2, 769, 2, 41, 2, 89, 2, 13, 2, 17, 2, 5, 2, 17, 2, 5, 2, 59649589127497217, 2, 37, 2, 41, 2, 13, 2, 97, 2, 149 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	REFERENCES	`C. Stanley Ogilvy and John T. Anderson, Excursions in Number Theory. Dover. New York: 1988. Page 82.`
	LINKS	`Walter Nissen, Home Page (listed in lieu of email address)` `Is there any value of n other than 1, 2 and 4, such that n^n+1 is a prime?`
	EXAMPLE	`4^4 + 1 = 257 is the largest known prime in the underlying sequence; 6^6 + 1 = 13 * 37 * 97, so a(6) = 13.`
	CROSSREFS	`Cf. A014566, A055386.` `Sequence in context: A089120 A019295 A170908 * A160503 A108429 A160127` `Adjacent sequences: A055382 A055383 A055384 * A055386 A055387 A055388`
	KEYWORD	`nonn`
	AUTHOR	`Walter Nissen Jun 24 2000`

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Last modified February 15 21:56 EST 2012. Contains 205860 sequences.