a(n) = the number of integers i in {1,2,...,L}, where L = lcm(1,2,...,n), having the property that the number of positive integer divisors of i that are less than or equal to n, is odd.
A241147
a(n) = the number of integers i in {1,2,...,L}, where L = lcm(1,2,...,n), having the property that the number of positive integer divisors of i that are less than or equal to n, is odd.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =33a(5) =33a(6) =225a(7) =405a(8) =1305a(9) =1235a(10) =13635a(11) =13635a(12) =177705a(13) =170775a(14) =170181a(15) =359073a(16) =6106815a(17) =5919705a(18) =112887225a(19) =109706355a(20) =110362725a(21) =107787735
External references
- oeis: A241147