OFFSET
0,1
EXAMPLE
a(3) = 160 because 160'' / 160' = 1296 / 432 = 3 and this is the least number to have this property.
MAPLE
with(numtheory): P:=proc(q) local a, b, k, n, p; for n from 0 to q do
for k from 2 to q do a:=k*add(op(2, p)/op(1, p), p=ifactors(k)[2]); b:=a*add(op(2, p)/op(1, p), p=ifactors(a)[2]); if b=n*a then print(k); break;
fi; od; od; end: P(10^9);
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Paolo P. Lava, May 19 2017
STATUS
approved