A183570 a(n) = n + floor(sqrt(n + 1)).

1, 2, 3, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 19, 20, 21, 22, 23, 24, 25, 26, 27, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 55, 56, 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, 85, 86, 87, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 109

Offset: 0

Author

Clark Kimberling, Jan 05 2011

Keywords

• nonn
• easy

Crossrefs

Cf. A028552 (complement, except for initial term).

Programs

Maple

A183570 := proc(n) n+floor(sqrt(n+1)) ; end proc:
seq(A183570(n),n=0..100) ; # R. J. Mathar, Jan 29 2011

Extensions

All terms corrected by R. J. Mathar, Jan 29 2011