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A174805 n+ceiling[sqrt(n)]+floor[sqrt(n)]. 0
0, 3, 5, 6, 8, 10, 11, 12, 13, 15, 17, 18, 19, 20, 21, 22, 24, 26, 27, 28, 29, 30, 31, 32, 33, 35, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 48, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 63, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 80, 82, 83, 84, 85, 86, 87 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..70.

MATHEMATICA

f[n_]:=n+Floor[Sqrt[n]]+Ceiling[Sqrt[n]]; Table[f[n], {n, 0, 5!}]

CROSSREFS

Cf. A038760, A174803, A174804

Sequence in context: A129359 A110801 A078339 * A183872 A288934 A186356

Adjacent sequences:  A174802 A174803 A174804 * A174806 A174807 A174808

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Mar 29 2010

STATUS

approved

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Last modified July 26 16:44 EDT 2021. Contains 346294 sequences. (Running on oeis4.)