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A183865 n-1+ceiling(3(n+2)/5); complement of A183864. 1
1, 4, 8, 13, 19, 27, 36, 46, 57, 69, 83, 98, 114, 131, 149, 169, 190, 212, 235, 259, 285, 312, 340, 369, 399, 431, 464, 498, 533, 569, 607, 646, 686, 727, 769, 813, 858, 904, 951, 999, 1049, 1100, 1152, 1205, 1259, 1315, 1372, 1430, 1489, 1549, 1611, 1674, 1738, 1803, 1869, 1937, 2006, 2076, 2147, 2219 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..60.

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

FORMULA

a(n)=n-1+ceiling(3(n+2)/5).

a(n) = 2 a(n-1) -a(n-2) +a(n-5) -2 a(n-6) +a(n-7). - R. J. Mathar, Mar 11 2012

MATHEMATICA

a=5/3; b=0;

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

Table[n-1+Ceiling[(n*n-b)/a], {n, 60}]

CROSSREFS

Cf. A183864.

Sequence in context: A312210 A312211 A034856 * A064609 A327566 A307159

Adjacent sequences:  A183862 A183863 A183864 * A183866 A183867 A183868

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Jan 07 2011

STATUS

approved

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Last modified October 17 21:17 EDT 2021. Contains 348065 sequences. (Running on oeis4.)