a(n) = sigma(n) * A003961(n), where A003961 shifts the prime factorization of n one step towards larger primes, and sigma is the sum of the divisors of n.

A341529

a(n) = sigma(n) * A003961(n), where A003961 shifts the prime factorization of n one step towards larger primes, and sigma is the sum of the divisors of n.

Terms

    a(0) =1a(1) =9a(2) =20a(3) =63a(4) =42a(5) =180a(6) =88a(7) =405a(8) =325a(9) =378a(10) =156a(11) =1260a(12) =238a(13) =792a(14) =840a(15) =2511a(16) =342a(17) =2925a(18) =460a(19) =2646a(20) =1760a(21) =1404a(22) =696a(23) =8100a(24) =1519a(25) =2142a(26) =5000a(27) =5544a(28) =930a(29) =7560

External references