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A183862 n+floor(sqrt(5n/2)); complement of A183863. 1
2, 4, 5, 7, 8, 9, 11, 12, 13, 15, 16, 17, 18, 19, 21, 22, 23, 24, 25, 27, 28, 29, 30, 31, 32, 34, 35, 36, 37, 38, 39, 40, 42, 43, 44, 45, 46, 47, 48, 50, 51, 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, 79, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 93, 94 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Also n+floor(sqrt(5n/2 + 1/2)) since 5n/2 + 1/2 is never a square. [From Charles R Greathouse IV, Feb 11 2011]

LINKS

Table of n, a(n) for n=1..80.

MATHEMATICA

a=5/2; b=1/2;

Table[n+Floor[(a*n+b)^(1/2)], {n, 80}]

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

PROG

(PARI) a(n)=n+sqrtint(5*n/2)

CROSSREFS

Cf. A183863.

Sequence in context: A253723 A014132 A184008 * A254058 A276220 A288204

Adjacent sequences:  A183859 A183860 A183861 * A183863 A183864 A183865

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Jan 07 2011

STATUS

approved

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Last modified June 25 00:41 EDT 2017. Contains 288708 sequences.