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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
OFFSET
0,2
MATHEMATICA
f[n_]:=n+Floor[Sqrt[n]]+Ceiling[Sqrt[n]]; Table[f[n], {n, 0, 5!}]
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved