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URL: https://oeis.org/history?seq=A002120

⇱ The On-Line Encyclopedia of Integer Sequences (OEIS)

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Showing entries 1-10 | older changes
a(1) = 0, a(2) = -2; for n > 2, a(n) + a(n-2) - a(n-3) - a(n-5) - ... - a(n-p) = (-1)^(n+1)*n if n is prime, otherwise = 0, where p = largest prime < n.
#17 by Jon E. Schoenfield at Sat Oct 14 22:34:34 EDT 2023
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#16 by Jon E. Schoenfield at Sat Oct 14 22:34:24 EDT 2023
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#15 by N. J. A. Sloane at Wed Jul 29 13:12:37 EDT 2015
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#14 by N. J. A. Sloane at Wed Jul 29 13:12:29 EDT 2015
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#13 by Charles R Greathouse IV at Fri May 10 12:43:44 EDT 2013
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Fri May 10
12:43
OEIS Server: https://oeis.org/edit/global/1911
#12 by Russ Cox at Fri Mar 30 16:43:19 EDT 2012
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Fri Mar 30
16:43
OEIS Server: https://oeis.org/edit/global/110
#11 by N. J. A. Sloane at Thu Nov 11 07:34:06 EST 2010
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#10 by N. J. A. Sloane at Tue Jun 01 03:00:00 EDT 2010
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#9 by N. J. A. Sloane at Fri Feb 27 03:00:00 EST 2009
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#8 by N. J. A. Sloane at Wed Dec 06 03:00:00 EST 2006
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