The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A130502 a(n) = numerator of the sum of reciprocals of those positive integers which are <= n and are not among earlier terms of A130502. 2
 1, 1, 5, 13, 13, 5, 39, 85, 821, 4357, 50447, 52757, 52757, 54737, 11317, 23327, 407647, 139373, 2710919, 13853047, 4712429, 4802869, 112455667, 343087331, 1742894239, 23000844907, 209982175763, 212850512663, 6252978300427 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS Diana Mecum, Table of n, a(n) for n = 1..100 EXAMPLE The positive integers which are <= 9 and are missing from the first 8 terms of this (numerator) sequence are 2,3,4,6,7,8,9. So a(9) is the numerator of (1/2 +1/3 +1/4 +1/6 +1/7 +1/8 + 1/9 = 821/504). CROSSREFS Cf. A130503. Sequence in context: A116981 A222756 A094150 * A320814 A274302 A274300 Adjacent sequences:  A130499 A130500 A130501 * A130503 A130504 A130505 KEYWORD frac,nonn AUTHOR Leroy Quet, May 31 2007 EXTENSIONS More terms from Diana L. Mecum, May 29 2007 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
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified June 17 05:30 EDT 2021. Contains 345080 sequences. (Running on oeis4.)