|
| |
|
|
A074468
|
|
Subscript m such that Sigma-Harmonic sequence, ssi[m]=Sum[1/sigma[k],{k,1,m}] >= n.
|
|
2
| |
|
|
1, 7, 29, 129, 571, 2525, 11167, 49372, 218295, 965177, 4267457, 18868240, 83424514, 368855252, 1630865929
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
REFERENCES
| J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 129, p. 44, Ellipses, Paris 2008.
|
|
|
MATHEMATICA
| {s=0, s1=0}; Do[s=s+(1/DivisorSigma[1, n]); If[Greater[Floor[s], s1], s1=Floor[s]; Print[{n, Floor[s]}]], {n, 1, 1000000}]
|
|
|
CROSSREFS
| Cf. A002387, A004080, A046024, A074631, A074633, A074467.
Sequence in context: A055427 A048876 A126394 * A179599 A175208 A071918
Adjacent sequences: A074465 A074466 A074467 * A074469 A074470 A074471
|
|
|
KEYWORD
| more,nonn
|
|
|
AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Aug 29 2002
|
|
|
EXTENSIONS
| 2 more terms from Lekraj Beedassy (blekraj(AT)yahoo.com), Jul 14 2008
a(11)-a(15) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Aug 22 2011
|
| |
|
|
