Square array A(n,k), n>=0, k>=1, read by antidiagonals, where row n is the sum of n-th powers of unitary divisors of k (divisors d such that gcd(d, k/d) = 1).
A286880
Square array A(n,k), n>=0, k>=1, read by antidiagonals, where row n is the sum of n-th powers of unitary divisors of k (divisors d such that gcd(d, k/d) = 1).
Terms
- a(0) =1a(1) =2a(2) =1a(3) =2a(4) =3a(5) =1a(6) =2a(7) =4a(8) =5a(9) =1a(10) =2a(11) =5a(12) =10a(13) =9a(14) =1a(15) =4a(16) =6a(17) =17a(18) =28a(19) =17a(20) =1a(21) =2a(22) =12a(23) =26a(24) =65a(25) =82a(26) =33a(27) =1a(28) =2a(29) =8
External references
- oeis: A286880