OFFSET
1,3
COMMENTS
Conjecture: a(n) = nondecreasing sequence of odd numbers.
LINKS
Ivan Neretin, Table of n, a(n) for n = 1..2500
MATHEMATICA
B[n_] := Plus @@ ((ks = Select[Range[n], GCD[n, #] == 1 &])^2)/Plus @@ ks; Select[B /@ Range[215], IntegerQ] (* Ivan Neretin, May 22 2015 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Jul 30 2010, Jul 31 2010
STATUS
approved