A014158 Numbers that are not the sum of 2 nonnegative cubes and a triangular number.

13, 20, 25, 32, 39, 40, 51, 58, 59, 62, 76, 77, 81, 84, 88, 89, 95, 96, 98, 102, 103, 104, 111, 115, 116, 123, 124, 151, 160, 165, 166, 168, 175, 176, 186, 193, 202, 205, 209, 213, 214, 215, 221, 228, 229, 241, 242, 263, 268, 270, 273, 287, 289, 291, 293, 306, 310, 312

Offset

1,1

Links

Robert Israel, Table of n, a(n) for n = 1..10000

Maple

N:= 500: # for terms <= N
cm:= floor(surd(N, 3)): CC:= select(`<=`, {seq(seq(i^3 + j^3, j=i..cm), i=0..cm)}, N):
tm:= floor((sqrt(1+8*N)-1)/2): T:= {seq(i*(i+1)/2, i=0..tm)}:
sort(convert(select(`<=`, {seq(seq(cc+t, t=T), cc=CC)}, N), list)); # Robert Israel, Apr 17 2026

Crossrefs

Cf. A014157 (complement).

Sequence in context: A366959 A098956 A302390 * A171143 A058016 A096277

Adjacent sequences: A014155 A014156 A014157 * A014159 A014160 A014161

Keyword

nonn

Author

N. J. A. Sloane

Status

approved