Not expressible as x^3+-y^2

[Ralf Stephan]

You wrote 
> this one seems not to be in OEIS:

Nor is this (please submit too):

Possible differences between a cube and the next smaller square.

? v=vector(200):for(n=2,10^7,t=n^3:s=sqrtint(t)^2:if(s==t,s=sqrtint(t-1)^2):tt=t-s:if(tt>0&&tt<=200&&!v[tt],v[tt]=n)):for(k=1,200,if(v[k],print1(k",")))

2,4,7,11,13,15,19,20,26,28,35,39,40,45,47,48,49,53,55,56,60,63,67,74,76,79,81,83,100,104,107,109,116,127,135,139,146,147,148,150,152,155,170,174,180,184,186,191,193,200,


ralf