A161339 - OEIS

A161339

Partial sums of A161205.

1, 3, 5, 8, 12, 16, 20, 24, 29, 35, 41, 47, 53, 59, 65, 72, 80, 88, 96, 104, 112, 120, 128, 136, 145, 155, 165, 175, 185, 195, 205, 215, 225, 235, 245, 256, 268, 280, 292, 304, 316, 328, 340, 352, 364, 376, 388, 400, 413, 427, 441, 455, 469, 483, 497, 511

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Nathaniel Johnston, Table of n, a(n) for n = 1..10000

MAPLE

A161339 := proc(n) option remember: local s: if(n=1)then return 1: fi: s:=sqrt(n): if(frac(s)=0)then return procname(n-1)+2*s-1: else return procname(n-1)+2*floor(s): fi: end: seq(A161339(n), n=1..60); # Nathaniel Johnston, May 06 2011

CROSSREFS

Cf. A000005, A000720, A018253, A160811, A160812, A161205.

Sequence in context: A310033 A289073 A023660 * A023562 A194207 A236538

Adjacent sequences: A161336 A161337 A161338 * A161340 A161341 A161342

KEYWORD

easy,nonn

AUTHOR

Omar E. Pol, Jun 19 2009

STATUS

approved