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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A084343 Duplicate of A083907.

Original entry on oeis.org

1, 2, 6, 6, 30, 30, 420, 420, 420, 420, 4620, 4620, 60060, 60060, 60060, 60060
Offset: 1

Views

Author

Keywords

A186944 Geometric mean of n-th row of A080508.

Original entry on oeis.org

1, 2, 2, 6, 6, 30, 30, 210, 210, 210, 210, 2310, 2310, 30030, 30030, 30030, 30030, 510510, 510510, 9699690, 9699690, 9699690, 9699690, 223092870, 223092870, 223092870, 223092870, 223092870, 223092870, 6469693230, 6469693230, 200560490130, 200560490130
Offset: 1

Views

Author

Michel Marcus, Aug 30 2013

Keywords

Crossrefs

Cf. A080509, A083907, A034386.

Programs

  • PARI
    a(n) = {if (n == 1, return (1)); if (n == 2, return (2)); f  = factor((n-1)!); prod(i=1, #f~, f[i,1]);} \\ Michel Marcus, Aug 30 2013
  • PARI
    a(n) = if(n==2, 2, prod(i=1,primepi(n-1),prime(i))) \\ Jeppe Stig Nielsen, Nov 04 2018

Formula

For n != 2, a(n) = A034386(n-1). - Jeppe Stig Nielsen, Nov 04 2018
Showing 1-2 of 2 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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