Numbers k such that sigma_k(k)/k is an integer, where sigma_k(k) is the sum of the k-th powers of the divisors of k (A023887).

A067313

Numbers k such that sigma_k(k)/k is an integer, where sigma_k(k) is the sum of the k-th powers of the divisors of k (A023887).

Terms

    a(0) =1a(1) =10a(2) =130a(3) =135a(4) =147a(5) =150a(6) =228a(7) =250a(8) =350a(9) =364a(10) =410a(11) =444a(12) =492a(13) =876a(14) =891a(15) =945a(16) =1014a(17) =1308a(18) =1372a(19) =1550a(20) =1690a(21) =1950a(22) =2050a(23) =2210a(24) =2373a(25) =2565a(26) =2850a(27) =3045a(28) =3050a(29) =3250

External references