id:A152923 - OEIS Search Results

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2^(2p-1)/8, where p is A000043(n).

+0
3

1, 4, 64, 1024, 4194304, 1073741824, 17179869184, 288230376151711744 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Ultraperfect numbers (A139306), divided by 8.`
	FORMULA	`a(n) = A139306(n)/8 = A152921(n)/4 = A152922(n)/2.`
	CROSSREFS	`Cf. A000043, A139292, A139306, A152921, A152922.` `Sequence in context: A154021 A013709 A139292 this_sequence A085807 A014729 A085532` `Adjacent sequences: A152920 A152921 A152922 this_sequence A152924 A152925 A152926`
	KEYWORD	`nonn`
	AUTHOR	`Omar E. Pol (info(AT)polprimos.com), Dec 15 2008`

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.