A155190 Non-triangular numbers having a unique representation as p + t, where p is prime and t is a triangular number.

2, 4, 7, 9, 16, 25, 27, 42, 54, 61, 63, 70, 75, 87, 90, 121, 126, 129, 135, 186, 211, 246, 315, 333, 345, 396, 405, 540, 556, 690, 717, 801, 924, 960, 1080, 1863, 2376, 2826, 3900, 6210, 8316

Offset

1,1

Comments

Conjectured to be finite. The prime terms are in A065397.

Links

Table of n, a(n) for n=1..41.

Example

n=p+t: 2=2+0; 4=3+1; 7=7+0; 9=3+6; 16=13+3; 25=19+6; 27=17+10; 42=41+1; 54=53+1

Crossrefs

A132399, A154752

Sequence in context: A110078 A257064 A085800 * A333317 A153776 A005625

Adjacent sequences: A155187 A155188 A155189 * A155191 A155192 A155193

Keyword

nonn

Author

T. D. Noe, Jan 21 2009

Status

approved