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A066766
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Decimal expansion of Sum_{k=1..inf} d(k)/2^k where d(k) are divisors of k, 1<=d<=k.
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2
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2, 7, 4, 4, 0, 3, 3, 8, 8, 8, 7, 5, 9, 4, 8, 8, 3, 6, 0, 4, 8, 0, 2, 1, 4, 8, 9, 1, 4, 9, 2, 2, 7, 2, 1, 6, 4, 3, 1, 1, 4, 2, 8, 9, 8, 1, 3, 1, 9, 6, 3, 9, 3, 1, 7, 8, 4, 8, 5, 2, 8, 8, 8, 4, 7, 3, 7, 9, 1, 2, 2, 8, 3, 2, 6, 3, 8, 9, 5, 6, 8, 8, 5, 6, 6, 2, 5, 2, 3, 1, 0, 7, 1, 2, 5, 0, 6, 8, 8, 7, 7, 3, 7, 4, 0
(list; constant; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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REFERENCES
| S. R. Finch, Mathematical Constants, Cambridge, 2003, pp. 354-361.
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LINKS
| S. R. Finch, Digital Search Tree Constants
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PROG
| (PARI) {smv(v)= s=0; for(i=1, matsize(v)[2], s=s+v[i]); s } {A066766(n)= sm=0; for(j=1, n, sm=sm+smv(divisors(j)/2^j)); sm*1.0 }
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CROSSREFS
| Cf. A066772.
Sequence in context: A110637 A092943 A196501 * A145433 A055200 A093590
Adjacent sequences: A066763 A066764 A066765 * A066767 A066768 A066769
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KEYWORD
| nonn,cons
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AUTHOR
| Randall L. Rathbun, Jan 16 2002
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