id:A090739 - OEIS Search Results

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Exponent of 2 in -1+3^(2n).

+0
10

3, 4, 3, 5, 3, 4, 3, 6, 3, 4, 3, 5, 3, 4, 3, 7, 3, 4, 3, 5, 3, 4, 3, 6, 3, 4, 3, 5, 3, 4, 3, 8, 3, 4, 3, 5, 3, 4, 3, 6, 3, 4, 3, 5, 3, 4, 3, 7, 3, 4, 3, 5, 3, 4, 3, 6, 3, 4, 3, 5, 3, 4, 3, 9, 3, 4, 3, 5, 3, 4 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(n) = A007814(n) + 3.`
	EXAMPLE	`n=2: -1+3^4=16.5 so a(2)=4.`
	MATHEMATICA	`Table[Part[Flatten[FactorInteger[ -1+3^(2*n)]], 2], {n, 1, 70}]`
	CROSSREFS	`Cf. A069895, A091512, A088660.` `Contribution from Johannes W. Meijer (meijgia(AT)hotmail.com), Jun 18 2009: (Start)` `Appears in A161737.` `(End)` `Sequence in context: A087275 A072942 A025267 this_sequence A076400 A121889 A045997` `Adjacent sequences: A090736 A090737 A090738 this_sequence A090740 A090741 A090742`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. and R. Stephan ((labos(AT)ana.sote.hu) and (ralf(AT)ark.in-berlin.de)), Jan 19 2004`

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Last modified December 10 00:48 EST 2009. Contains 170565 sequences.

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