id:A072639 - OEIS Search Results

Search: id:A072639

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a(0) = 0, a(n) = sum_{i=0}^{n-1} 2^((2^i)-1).

+0
5

0, 1, 3, 11, 139, 32907, 2147516555, 9223372039002292363, 170141183460469231740910675754886398091, 57896044618658097711785492504343953926805133516280751251469702679711451218059 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`Maximum position in A072644 where the value n occurs.` `Also partial sums of A058891, i.e. the first differences are there. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 15 2007`
	MAPLE	`A072639 := proc(n) local i; add(2^((2^i)-1), i=0..(n-1)); end;`
	CROSSREFS	`Binary width of each term: A000079. Cf. A072638, A072640, A072654.` `Cf. A058891.` `Adjacent sequences: A072636 A072637 A072638 this_sequence A072640 A072641 A072642` `Sequence in context: A121897 A067657 A063502 this_sequence A100459 A010682 A080987`
	KEYWORD	`nonn`
	AUTHOR	`Antti Karttunen Jun 02 2002`

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Last modified May 16 23:01 EDT 2008. Contains 139884 sequences.

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