OFFSET
0,2
COMMENTS
T(n,k) is also the sum of the divisors of the n-th nonnegative power of the k-th prime, n >= 0, k >= 1.
FORMULA
EXAMPLE
The corner of the square array is as follows:
A000012 1, 1, 1, 1, 1, 1, 1, ...
A008864 3, 4, 6, 8, 12, 14, 18, ...
A060800 7, 13, 31, 57, 133, 183, 307, ...
A131991 15, 40, 156, 400, 1464, 2380, 5220, ...
A131992 31, 121, 781, 2801, 16105, 30941, 88741, ...
A131993 63, 364, 3906, 19608, 177156, 402234, 1508598, ...
....... 127, 1093, 19531, 137257, 1948717, 5229043, 25646167, ...
....... 255, 3280, 97656, 960800, 21435888, 67977560, 435984840, ...
....... 511, 9841, 488281, 6725601, 235794769, 883708281, 7411742281, ...
...
PROG
(PARI) T(n, k) = sigma(prime(k)^n); \\ Michel Marcus, Sep 13 2018
CROSSREFS
Columns 1-15: A126646, A003462, A003463, A023000, A016123, A091030, A091045, A218722, A218726, A218732, A218734, A218740, A218744, A218746, A218750.
Main diagonal gives A319074.
KEYWORD
AUTHOR
Omar E. Pol, Sep 09 2018
STATUS
approved