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A183862 a(n) = n + floor(sqrt(5*n/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(5*n/2 + 1/2)) since 5*n/2 + 1/2 is never a square. - Charles R Greathouse IV, Feb 11 2011
LINKS
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 A346128 A276220
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Jan 07 2011
STATUS
approved

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Last modified June 14 14:51 EDT 2024. Contains 373400 sequences. (Running on oeis4.)