A139433 a(n) = the n-th nonnegative integer m where A139432(m) = 0.

0, 8, 23, 43, 45, 66, 77, 101, 107, 196, 200, 202, 259, 263, 267, 273, 285, 328, 353, 404, 428, 430, 489, 498, 519, 523, 607, 689, 728, 809, 913, 920, 922, 928, 945, 1044, 1047, 1055, 1167, 1218, 1222, 1300, 1332, 1338, 1492, 1511, 1606, 1610, 1615, 1630, 1637

Offset

1,2

Comments

Each term a(n) of this sequence is such that (2k)^2 <= a(n) < (2k+1)^2, for some nonnegative integer k.

In other words, m is not in this sequence if (2k-1)^2 <= m < (2k)^2, for any positive integer k.

Links

H. v. Eitzen, Table of n, a(n) for n=1..10000

Mathematica

t = {a = 0}; Do[If[a < (x = DivisorSigma[0, n]), a = a + x, a = a - x]; If[a == 0, AppendTo[t, n]], {n, 1640}]; t (* Jayanta Basu, Jun 06 2013 *)

Crossrefs

Cf. A139432.

Sequence in context: A164131 A212458 A114381 * A226600 A178072 A351966

Adjacent sequences: A139430 A139431 A139432 * A139434 A139435 A139436

Keyword

nonn

Author

Leroy Quet, Apr 21 2008

Extensions

Offset corrected ("n-th" should start with "1st", not "0th") Hagen von Eitzen, Jun 17 2009

More terms copied from b-file by Hagen von Eitzen, Jul 20 2009

Status

approved