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A183858 n+floor(sqrt(3n)); complement of A183859. 1
2, 4, 6, 7, 8, 10, 11, 12, 14, 15, 16, 18, 19, 20, 21, 22, 24, 25, 26, 27, 28, 30, 31, 32, 33, 34, 36, 37, 38, 39, 40, 41, 42, 44, 45, 46, 47, 48, 49, 50, 52, 53, 54, 55, 56, 57, 58, 60, 61, 62, 63, 64, 65, 66, 67, 68, 70, 71, 72, 73, 74, 75, 76, 77, 78, 80, 81, 82, 83, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 114, 115, 116, 117 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..100.

FORMULA

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

MATHEMATICA

a=3; b=0;

Table[n+Floor[(a*n+b)^(1/2)], {n, 100}]

Table[n-1+Ceiling[(n*n-b)/a], {n, 80}]

PROG

(PARI) a(n)=n+sqrtint(3*n)

CROSSREFS

Cf. A183859.

Sequence in context: A324561 A288258 A075313 * A135673 A285667 A187568

Adjacent sequences:  A183855 A183856 A183857 * A183859 A183860 A183861

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Jan 07 2011

EXTENSIONS

Corrected by Charles R Greathouse IV, Jan 19 2011.

STATUS

approved

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Last modified July 23 11:28 EDT 2021. Contains 346259 sequences. (Running on oeis4.)