A184016 n+floor(3*sqrt(n)); complement of A184017.

4, 6, 8, 10, 11, 13, 14, 16, 18, 19, 20, 22, 23, 25, 26, 28, 29, 30, 32, 33, 34, 36, 37, 38, 40, 41, 42, 43, 45, 46, 47, 48, 50, 51, 52, 54, 55, 56, 57, 58, 60, 61, 62, 63, 65, 66, 67, 68, 70, 71, 72, 73, 74, 76, 77, 78, 79, 80, 82, 83, 84, 85, 86, 88, 89, 90, 91, 92, 93, 95, 96, 97, 98, 99, 100, 102, 103, 104, 105, 106, 108, 109, 110, 111, 112, 113, 114, 116, 117, 118, 119, 120, 121, 123, 124, 125, 126, 127, 128, 130

Offset

1,1

Links

Table of n, a(n) for n=1..100.

Formula

a(n)=n+floor(3*sqrt(n)).

Mathematica

a=9; b=0;
Table[n+Floor[(a*n+b)^(1/2)], {n, 100}]
Table[n-1+Ceiling[(n*n-b)/a], {n, 80}]

Crossrefs

Cf. A184017.

Sequence in context: A090967 A349707 A272475 * A075254 A284913 A139203

Adjacent sequences: A184013 A184014 A184015 * A184017 A184018 A184019

Keyword

nonn,easy

Author

Clark Kimberling, Jan 09 2011

Status

approved