a(1) = 0, a(n) = (e1*i1! + e2*i2! + ... + ez*iz!) for n = prime(i1)^e1 * prime(i2)^e2 * ... * prime(iz)^ez, where prime(k) is the k-th prime, A000040(k).

A276075

a(1) = 0, a(n) = (e1*i1! + e2*i2! + ... + ez*iz!) for n = prime(i1)^e1 * prime(i2)^e2 * ... * prime(iz)^ez, where prime(k) is the k-th prime, A000040(k).

Terms

    a(0) =0a(1) =1a(2) =2a(3) =2a(4) =6a(5) =3a(6) =24a(7) =3a(8) =4a(9) =7a(10) =120a(11) =4a(12) =720a(13) =25a(14) =8a(15) =4a(16) =5040a(17) =5a(18) =40320a(19) =8a(20) =26a(21) =121a(22) =362880a(23) =5a(24) =12a(25) =721a(26) =6a(27) =26a(28) =3628800a(29) =9

External references