a(n) is the number of positive integers k for which Sum_{i=1..j} (p_i+e_i) = n, where p_1^e_1*...*p_j^e_j is the prime factorization of k.

A382330

a(n) is the number of positive integers k for which Sum_{i=1..j} (p_i+e_i) = n, where p_1^e_1*...*p_j^e_j is the prime factorization of k.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =2a(4) =2a(5) =3a(6) =4a(7) =6a(8) =8a(9) =11a(10) =15a(11) =21a(12) =27a(13) =36a(14) =47a(15) =61a(16) =79a(17) =104a(18) =133a(19) =170a(20) =215a(21) =272a(22) =343a(23) =433a(24) =542a(25) =678a(26) =845a(27) =1050a(28) =1300a(29) =1608

External references