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A183863 n-1+ceiling((2/5)(-1/2+n^2)); complement of A183862. 1
1, 3, 6, 10, 14, 20, 26, 33, 41, 49, 59, 69, 80, 92, 104, 118, 132, 147, 163, 179, 197, 215, 234, 254, 274, 296, 318, 341, 365, 389, 415, 441, 468, 496, 524, 554, 584, 615, 647, 679, 713, 747, 782, 818, 854, 892, 930, 969, 1009, 1049, 1091, 1133, 1176, 1220, 1264, 1310, 1356, 1403, 1451, 1499, 1549, 1599, 1650, 1702, 1754, 1808, 1862, 1917, 1973, 2029 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..70.

Index entries for linear recurrences with constant coefficients, signature (2,-1,0,0,1,-2,1).

FORMULA

a(n)=n-1+ceiling((2/5)(-1/2+n^2)).

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}]

CROSSREFS

Cf., A183862.

Sequence in context: A236758 A272058 A244360 * A140949 A025206 A049989

Adjacent sequences:  A183860 A183861 A183862 * A183864 A183865 A183866

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Jan 07 2011

STATUS

approved

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Last modified September 26 15:53 EDT 2021. Contains 347668 sequences. (Running on oeis4.)