OFFSET
1,1
COMMENTS
LINKS
Giovanni Resta, Table of n, a(n) for n = 1..717
NĂºmeros y algo mas, 9 + 11+ 25 = 91125^(1/3) etc, post on facebook.com, Sep 30 2019.
EXAMPLE
5+1+2 = 512^(1/3) = 8,
9+11+25 = 91125^(1/3) = 45,
418+1062+131 = (4181062131)^(1/3) = 1611, ...
PROG
(PARI) is(n, Ln=A055642(n), n3=n^3, Ln3=A055642(n3))={my(ab, c); for(Lc=Ln3-2*Ln, Ln, [ab, c]=divrem(n3, 10^Lc); n-c<10^(Ln-1) || c < 10^(Lc-1) || for( Lb=Ln3-Ln-Lc, Ln, vecsum(divrem(ab, 10^Lb)) == n-c && ab%10^Lb>=10^(Lb-1)&& return(concat(divrem(ab, 10^Lb)~, c))))} \\ A055642(n)=logint(n, 10)+1 = #digits(n)
for( Ln=1, oo, for( n=10^(Ln-1), 10^Ln-1, (t=is(n, Ln))&& print1(t", ")))
CROSSREFS
KEYWORD
nonn,base,tabf
AUTHOR
M. F. Hasler, Oct 07 2019
STATUS
approved