A023395 - OEIS

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A023395

Only Fermat number divisible by A023394(n) is 2^2^a(n) + 1.

0, 1, 2, 3, 5, 4, 12, 6, 11, 11, 9, 5, 18, 12, 10, 12, 23, 16, 15, 10, 19, 12, 19, 13, 36, 21, 38, 32, 25, 17, 39, 6, 26, 27, 30, 30, 8, 12, 15, 29, 38, 7, 25, 27 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,3`
	LINKS	`Wilfrid Keller, Prime factors k.2^n + 1 of Fermat numbers F_m`
	CROSSREFS	`Sequence in context: A193971 A171038 A138153 * A193798 A101409 A131401` `Adjacent sequences: A023392 A023393 A023394 * A023396 A023397 A023398`
	KEYWORD	`nonn`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`
	EXTENSIONS	`a(25)-a(41) computed using data from Wilfrid Keller -- T. D. Noe (noe(AT)sspectra.com), Feb 01 2009` `Three more terms -- T. D. Noe (noe(AT)sspectra.com), Feb 03 2009`

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Last modified February 14 01:35 EST 2012. Contains 205567 sequences.