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deleted 53 characters in body

edited Aug 13, 2022 at 15:42

edited Aug 13, 2022 at 15:42

Pari/GP, 4844 bytes

0 is falsy. everything else is truthy.

n->n*Vec>n&&#(1/(1-x^6)/(1-x^9)/(1-x^20)+O(x^n++)%x^n++)[n]==n

0 is falsy. everything else is truthy.

n->n*Vec(1/(1-x^6)/(1-x^9)/(1-x^20)+O(x^n++))[n]

n->n&&#(1/(1-x^6)/(1-x^9)/(1-x^20)%x^n++)==n

edited body

edited Nov 28, 2018 at 10:01

edited Nov 28, 2018 at 10:01

0 is falsy. everything else is truthy.

n->n*Pol>n*Vec(1/(1-x^6)/(1-x^9)/(1-x^20)+O(x*x^nx^n++))\x^n[n]

0 is falsy. everything else is truthy.

n->n*Pol(1/(1-x^6)/(1-x^9)/(1-x^20)+O(x*x^n))\x^n

0 is falsy. everything else is truthy.

n->n*Vec(1/(1-x^6)/(1-x^9)/(1-x^20)+O(x^n++))[n]

answered Jul 17, 2017 at 0:43

answered Jul 17, 2017 at 0:43

0 is falsy. everything else is truthy.

n->n*Pol(1/(1-x^6)/(1-x^9)/(1-x^20)+O(x*x^n))\x^n