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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
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: A034856 A365700 A362290 * A064609 A327566 A307159
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Jan 07 2011
STATUS
approved

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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)