OFFSET
1,2
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..16384
PROG
(PARI)
A289271(n) = { my(v=0, i=0, x=1); for(d=2, oo, if(n==1, return(v)); if(1==gcd(x, d)&&1==omega(d), if(!(n%d)&&1==gcd(d, n/d), v += 2^i; n /= d; x *= d); i++)); }; \\ After Rémy Sigrist's program for A289271.
A289272(n) = { my(m=1, pp=1); while(n>0, pp++; while(!isprimepower(pp)||(gcd(pp, m)>1), pp++); if(n%2, m *= pp); n >>=1); (m); };
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jan 01 2019
STATUS
approved