Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.
1,1
Table of n, a(n) for n=1..55.
(PARI) is_A014134(n)=for(k=0, sqrtint(n*2), issquare(n-k*(k+1)/2)&return); 1 (M. F. Hasler, Jan 05 2009)
Cf. A140867.
Sequence in context: A178968 A006613 A204221 * A085989 A095097 A187227
Adjacent sequences: A014131 A014132 A014133 * A014135 A014136 A014137
nonn,easy
N. J. A. Sloane.
approved