cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A227866 Derived from von Mangoldt matrix sequence.

Original entry on oeis.org

1, 1, 4, 27, 64, 3125, 288, 823543, 147456, 4251528, 460800, 285311670611, 111974400, 302875106592253, 3251404800, 13436928000, 106542032486400, 827240261886336764177, 1053455155200000, 1978419655660313589123979, 102395841085440000
Offset: 0

Views

Author

Mats Granvik, Nov 02 2013

Keywords

Comments

Since the logarithm of n is given by the limit of Zeta(s)*Sum_{k=1..n} ((1 - (If k mod n = 0 then n else 0))/k^(s - 1)) as s -> 1, it is natural to ask what the von Mangoldt function variant might look like starting from the table A191898, instead of table A167407. - Mats Granvik, Nov 11 2013

Crossrefs

Programs

  • Mathematica
    Clear[nn, t, n, k, i, s]; nn = 20; t[n_, 1] = 1; t[1, k_] = 1; t[n_, k_] := t[n, k] = If[n >= k, -Sum[t[n - i, k], {i, 1, k - 1}], -Sum[t[k - i, n], {i, 1, n - 1}]]; Exp[Table[Limit[Zeta[s]*Sum[If[n == 1, 0, t[n, k]]/k^(s - 1), {k, 1, n}], s -> 1], {n, 0, nn}]]*(Range[nn + 1] - 1)!

Formula

a(prime(n)) = A000312(prime(n)).
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