a(n) = sigma(n)*pi(n^2), where sigma(n) is the sum of all (positive) divisors of n, and pi(x) is the number of primes not exceeding x.
A263325
a(n) = sigma(n)*pi(n^2), where sigma(n) is the sum of all (positive) divisors of n, and pi(x) is the number of primes not exceeding x.
Terms
- a(0) =0a(1) =6a(2) =16a(3) =42a(4) =54a(5) =132a(6) =120a(7) =270a(8) =286a(9) =450a(10) =360a(11) =952a(12) =546a(13) =1056a(14) =1152a(15) =1674a(16) =1098a(17) =2574a(18) =1440a(19) =3276a(20) =2720a(21) =3312a(22) =2376a(23) =6300a(24) =3534a(25) =5124a(26) =5160a(27) =7672a(28) =4380a(29) =11088
External references
- oeis: A263325