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A184010
n + floor(sqrt(-1+4n/3)); complement of A001859 (except for initial zero).
0
1, 3, 4, 6, 7, 8, 9, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23, 25, 26, 27, 28, 29, 30, 31, 32, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 103, 104, 105, 106, 107, 108, 109, 110, 111
OFFSET
1,2
FORMULA
a(n) = n + floor(sqrt(-1+4n/3))
MATHEMATICA
a=4/3; b=-1; Table[n+Floor[(a*n+b)^(1/2)], {n, 100}]
CROSSREFS
Cf. A001859.
Sequence in context: A080804 A164386 A111909 * A256827 A175139 A182835
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Jan 08 2011
STATUS
approved