A106224 - OEIS

A106224

Coefficients of g.f. A(x) where 0 <= a(n) <= 5 for all n>1, with initial terms {1,6}, such that A(x)^(1/6) consists entirely of integer coefficients.

1, 6, 3, 2, 3, 0, 0, 0, 3, 4, 3, 0, 0, 0, 3, 2, 0, 0, 0, 0, 3, 2, 0, 0, 4, 0, 0, 2, 0, 0, 2, 0, 0, 0, 3, 0, 3, 0, 0, 4, 0, 0, 4, 0, 0, 4, 3, 0, 2, 0, 0, 4, 0, 0, 5, 0, 3, 2, 0, 0, 3, 0, 0, 0, 3, 0, 3, 0, 3, 0, 3, 0, 2, 0, 3, 0, 0, 0, 2, 0, 0, 0, 3, 0, 2, 0, 0, 0, 3, 0, 5, 0, 3, 0, 0, 0, 3, 0, 0, 0, 0, 0, 4, 0, 0

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OFFSET

0,2

COMMENTS

Equals the self-convolution 6th power of A106225. What is the frequency of occurrence of the nonzero digits?

LINKS

Table of n, a(n) for n=0..104.

FORMULA

A(z)=0 at z=-0.18172379526003557530948965401615522817...

EXAMPLE

A(x) = 1 + 6*x + 3*x^2 + 2*x^3 + 3*x^4 + 3*x^8 + 4*x^9 + 3*x^10 +...

A(x)^(1/6) = 1 + x - 2*x^2 + 7*x^3 - 27*x^4 + 114*x^5 - 506*x^6 +-...

A106225 = {1,1,-2,7,-27,114,-506,2322,-10919,52316,-254369,...}.

PROG

(PARI) {a(n)=local(A=1+6*x); if(n==0, 1, for(j=1, n, for(k=0, 5, t=polcoeff((A+k*x^j+x*O(x^j))^(1/6), j); if(denominator(t)==1, A=A+k*x^j; break))); return(polcoeff(A+x*O(x^n), n)))}

CROSSREFS

Cf. A106225, A106216, A106220, A106222, A106226.

Sequence in context: A068996 A362871 A068924 * A254571 A360562 A244815

Adjacent sequences: A106221 A106222 A106223 * A106225 A106226 A106227

KEYWORD

nonn

AUTHOR

Paul D. Hanna, May 01 2005

STATUS

approved