login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A212657 Number of subsets of {1,2,...,n} with the sum of reciprocals <= 1. 2
1, 2, 3, 5, 8, 14, 26, 46, 83, 151, 276, 503, 921, 1689, 3113, 5730, 10549, 19441, 35868, 66209, 122316, 226157, 418373, 774394, 1434130, 2657246, 4925837, 9135444, 16949660, 31460444, 58415377, 108502932, 201604081, 374708242, 696650259, 1295562800, 2410001851, 4484208954, 8345621293 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

The number of distinct sums of reciprocals is given by A212607.

LINKS

Robert Gerbicz, Table of n, a(n) for n = 0..95

CROSSREFS

Cf. A212658 (reciprocals can appear multiple times).

Cf. A212606, A212607, A020473, A092669, A092671, A208480.

Sequence in context: A062178 A173282 A178833 * A065955 A196118 A104880

Adjacent sequences:  A212654 A212655 A212656 * A212658 A212659 A212660

KEYWORD

nonn

AUTHOR

Max Alekseyev, May 23 2012

EXTENSIONS

a(32)-a(35) from Alois P. Heinz, May 23 2012

a(36)-a(95) from Robert Gerbicz, May 23 2012

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified March 29 07:21 EDT 2017. Contains 284250 sequences.