id:A057940 - OEIS Search Results

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Number of prime factors of 4^n + 1 (counted with multiplicity).

+0
2

1, 1, 2, 1, 3, 2, 3, 1, 4, 2, 3, 3, 4, 2, 6, 2, 4, 4, 4, 2, 6, 3, 5, 3, 7, 3, 6, 3, 3, 4, 5, 2, 6, 4, 7, 5, 5, 4, 10, 3, 5, 5, 5, 4, 11, 2, 4, 3, 6, 6, 9, 2, 4, 6, 7, 5, 8, 3, 7, 6, 6, 4, 10, 2, 10, 7, 6, 4, 8, 4, 6, 7, 5, 2, 14, 4, 9, 5, 4, 4, 10, 4, 6, 8, 11, 4, 8, 3, 4, 8, 11, 4, 9, 5, 10, 4, 9, 8, 12, 6 (list; graph; listen)

	OFFSET	`1,3`
	LINKS	`S. S. Wagstaff, Jr., The Cunningham Project` `S. S. Wagstaff, Jr., Main Tables from the Cunningham Project.`
	FORMULA	`a(n) = A057957(2n) - A057957(n) - T. D. Noe (noe(AT)sspectra.com), Jun 19 2003`
	CROSSREFS	`Cf. A057934-A057941, A054992.` `Cf. A057957.` `Sequence in context: A151682 A159918 A108663 this_sequence A097285 A057432 A038568` `Adjacent sequences: A057937 A057938 A057939 this_sequence A057941 A057942 A057943`
	KEYWORD	`nonn`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), Oct 15 2000.`

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.

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