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A319076
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Square array T(n,k) read by antidiagonal upwards in which column k lists the partial sums of the powers of the k-th prime, n >= 0, k >= 1.
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2
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1, 3, 1, 7, 4, 1, 15, 13, 6, 1, 31, 40, 31, 8, 1, 63, 121, 156, 57, 12, 1, 127, 364, 781, 400, 133, 14, 1, 255, 1093, 3906, 2801, 1464, 183, 18, 1, 511, 3280, 19531, 19608, 16105, 2380, 307, 20, 1, 1023, 9841, 97656, 137257, 177156, 30941, 5220, 381, 24, 1, 2047, 29524, 488281, 960800, 1948717
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OFFSET
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0,2
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COMMENTS
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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.
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LINKS
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FORMULA
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T(n,k) = Sum_{j=0..n} A000040(k)^j.
T(n,k) = Sum_{j=0..n} A319075(j,k).
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EXAMPLE
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The corner of the square array is as follows:
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, ...
...
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PROG
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(PARI) T(n, k) = sigma(prime(k)^n); \\ Michel Marcus, Sep 13 2018
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CROSSREFS
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Columns 1-15: A126646, A003462, A003463, A023000, A016123, A091030, A091045, A218722, A218726, A218732, A218734, A218740, A218744, A218746, A218750.
Cf. A000079, A000244, A000351, A000420, A001020, A001022, A001026, A001029, A009967, A009973, A009975, A009981, A009985, A009987, A009991.
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KEYWORD
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AUTHOR
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STATUS
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approved
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