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A183860 n+floor(sqrt(3n+1)); complement of A183861. 1
3, 4, 6, 7, 9, 10, 11, 13, 14, 15, 16, 18, 19, 20, 21, 23, 24, 25, 26, 27, 29, 30, 31, 32, 33, 34, 36, 37, 38, 39, 40, 41, 43, 44, 45, 46, 47, 48, 49, 51, 52, 53, 54, 55, 56, 57, 58, 60, 61, 62, 63, 64, 65, 66, 67, 69, 70, 71, 72, 73, 74, 75, 76, 77, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 101, 102, 103, 104, 105, 106 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..90.

FORMULA

a(n)=n+floor(sqrt(3n+1)).

MATHEMATICA

a=3; b=1;

Table[n+Floor[(a*n+b)^(1/2)], {n, 90}]

Table[n-1+Ceiling[(n*n-b)/a], {n, 70}]

CROSSREFS

Cf. A183861.

Sequence in context: A070762 A061208 A325439 * A298109 A184429 A248185

Adjacent sequences:  A183857 A183858 A183859 * A183861 A183862 A183863

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Jan 07 2011

STATUS

approved

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Last modified August 3 21:13 EDT 2021. Contains 346441 sequences. (Running on oeis4.)