OFFSET
1,4
COMMENTS
Previous name was: a(n) is the least integer such that the greatest prime factor of n is greater than or equal to its a(n)th root.
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..16384
MATHEMATICA
Table[n = 1; m = Max[FactorInteger[x][[All, 1]]]; While[x^(1/n) > m, ++n]; n, {x, START, END}]
PROG
(PARI)
A006530(n) = if(1==n, n, vecmax(factor(n)[, 1]));
A179953(n) = { my(q = A006530(n), m = q, k=1); while(m < n, m *= q; k++); k; }; \\ Antti Karttunen, Oct 20 2017
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Dylan Hamilton, Aug 03 2010
EXTENSIONS
a(1) = 1 prepended and definition rewritten by Antti Karttunen, Oct 20 2017
STATUS
approved