OFFSET
0,2
EXAMPLE
a(10) = 7 since there are 7 proper divisors of A053742(10) = 525 ending with 5: 5, 15, 25, 35, 75, 105 and 175.
MATHEMATICA
a[n_]:=Length[Drop[Select[Divisors[25+50n], (Mod[#, 10]==5&)], -1]]; Array[a, 90, 0]
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Stefano Spezia, Jul 15 2021
STATUS
approved