A113913 - OEIS

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A113913

Number of distinct prime factors of 3^(3^n)+1.

1, 2, 4, 6, 11, 20, 27 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`The term omega(3^(3^6)+1) was obtained with ECM factoring.`
	FORMULA	`a(n) = A001221(A129290(n)).`
	PROG	`(PARI) for(x=1, 6, print1( omega(3^(3^x)+1), ", "))`
	CROSSREFS	`Sequence in context: A000694 A164137 A018170 * A002097 A026757 A026385` `Adjacent sequences: A113910 A113911 A113912 * A113914 A113915 A113916`
	KEYWORD	`hard,more,nonn`
	AUTHOR	`Jorge Coveiro (jorgecoveiro(AT)yahoo.com), Jan 29 2006`

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Last modified February 16 18:43 EST 2012. Contains 205939 sequences.