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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A127469 a(n) = n * A062949(n).

Original entry on oeis.org

1, 6, 15, 36, 45, 90, 91, 200, 207, 270, 231, 540, 325, 546, 675, 1040, 561, 1242, 703, 1620, 1365, 1386, 1035, 3000, 1725, 1950, 2565, 3276, 1653, 4050, 1891, 5152, 3465, 3366, 4095, 7452, 2701, 4218, 4875, 9000, 3321, 8190, 3655, 8316, 9315, 6210, 4371, 15600
Offset: 1

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Author

Gary W. Adamson, Jan 15 2007

Keywords

Examples

			a(5) = 45 = 5 * A062949(5) = 5 * 9.
		

Crossrefs

Cf. A062949.
Row sums of triangle A127470.

Programs

  • Maple
    A127469 := proc(n) n*A062949(n) ; end proc:
    seq(A127469(n),n=1..80) ; # R. J. Mathar, Feb 09 2011
  • Mathematica
    f[p_, e_] := ((e+1)*p^(e+1)-(e+2)*p^e+1)/(p-1); a[1] = 1; a[n_] := n * Times @@ f @@@ FactorInteger[n]; Array[a, 60] (* Amiram Eldar, Aug 31 2023 *)

Formula

a(n) = n * A062949(n).
Multiplicative with a(p^e) = ((e+1)*p^(2*e+1) - (e+2)*p^(2*e) + p^e)/(p-1). - Amiram Eldar, Aug 31 2023

Extensions

More terms from Amiram Eldar, Aug 31 2023
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