A184110 - OEIS

A184110

n + floor(3*sqrt(n+1)).

5, 7, 9, 10, 12, 13, 15, 17, 18, 19, 21, 22, 24, 25, 27, 28, 29, 31, 32, 33, 35, 36, 37, 39, 40, 41, 42, 44, 45, 46, 47, 49, 50, 51, 53, 54, 55, 56, 57, 59, 60, 61, 62, 64, 65, 66, 67, 69, 70, 71, 72, 73, 75, 76, 77, 78, 79, 81, 82, 83, 84, 85, 87, 88, 89, 90, 91, 92, 94, 95, 96, 97, 98, 99, 101, 102, 103, 104, 105, 107, 108, 109, 110, 111, 112, 113, 115, 116, 117, 118, 119, 120, 122, 123, 124, 125, 126, 127, 129, 130

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

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

FORMULA

a(n) = n + floor(3*sqrt(n+1))

MATHEMATICA

a=9; b=9;

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

#+Floor[3*Sqrt[#+1]]&/@Range[150] (* Harvey P. Dale, Jul 11 2014 *)

CROSSREFS