id:A066772 - OEIS Search Results

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Continued fraction expansion for Sum_{k=1..inf} d(k)/2^k where d(k) are divisors of k, 1<=d<=k.

+0
2

2, 1, 2, 1, 9, 1, 2, 1, 1, 1, 5, 8, 1, 3, 2, 3, 2, 2, 2, 2, 1, 3, 3, 4, 12, 1, 1, 1, 11, 4, 15, 6, 3, 3, 2, 1, 20, 4, 4, 1, 4, 1, 2, 1, 2, 6, 1, 2, 1, 28, 107, 1, 4, 4, 3, 1, 2, 2, 4, 2, 3, 51, 1, 1, 1, 4, 2, 4, 1, 20, 20, 1, 14, 3, 27, 1, 4, 3, 14, 329, 1, 1, 1, 111, 2, 3, 1, 2, 1, 4, 1, 6, 1, 4, 1 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`A(1669) accurate to 500 decimal digits`
	REFERENCES	`S. R. Finch, Mathematical Constants, Cambridge, 2003, pp. 354-361.`
	LINKS	`S. R. Finch, Digital Search Tree Constants`
	PROGRAM	`(PARI) {smv(v)= s=0; for(i=1, matsize(v)[2], s=s+v[i]); s } {A66666(n)= sm=0; for(j=1, n, sm=sm+smv(divisors(j)/2^j)); sm*1.0 }`
	CROSSREFS	`Cf. A066766.` `Sequence in context: A145999 A011128 A146003 this_sequence A104060 A062347 A124781` `Adjacent sequences: A066769 A066770 A066771 this_sequence A066773 A066774 A066775`
	KEYWORD	`nonn,cofr`
	AUTHOR	`Randall L. Rathbun, Jan 16 2002`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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