The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A023818

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A023818

Sum of exponents in prime-power factorization of C(2n,n-2).
(history; published version)

#7 by Alois P. Heinz at Thu Nov 02 17:50:42 EDT 2017

STATUS

proposed

approved

#6 by Ivan Neretin at Thu Nov 02 16:52:37 EDT 2017

STATUS

editing

proposed

#5 by Ivan Neretin at Thu Nov 02 16:52:28 EDT 2017

EXTENSIONS

Offset changed corrected to 2 by Ivan Neretin, Nov 02 2017

#4 by Ivan Neretin at Thu Nov 02 16:52:07 EDT 2017

OFFSET

1,2,2

LINKS

Ivan Neretin, <a href="/A023818/b023818.txt">Table of n, a(n) for n = 2..10000</a>

MATHEMATICA

Join[{0}, Table[Total[FactorInteger[Binomial[2 n, n - 2]][[All, 2]]], {n, 3, 80}]] (* Ivan Neretin, Nov 02 2017 *)

EXTENSIONS

Offset changed to 2 by Ivan Neretin, Nov 02 2017

STATUS

approved

editing

#3 by Russ Cox at Fri Mar 30 18:55:53 EDT 2012

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

Clark Kimberling

Discussion

Fri Mar 30

18:55

OEIS Server: https://oeis.org/edit/global/285

#2 by N. J. A. Sloane at Fri May 16 03:00:00 EDT 2003

KEYWORD

nonn,new

nonn

AUTHOR

Clark Kimberling (ck6@cedar.(AT)evansville.edu)

#1 by N. J. A. Sloane at Sun Jun 14 03:00:00 EDT 1998

NAME

Sum of exponents in prime-power factorization of C(2n,n-2).

DATA

0, 2, 3, 5, 4, 4, 6, 8, 6, 7, 8, 9, 8, 10, 11, 12, 11, 11, 12, 14, 11, 12, 14, 15, 13, 15, 16, 16, 13, 13, 17, 19, 14, 16, 18, 17, 15, 18, 19, 22, 20, 20, 21, 24, 21, 20, 23, 24, 23, 24, 22, 23, 22, 23, 24, 25, 22, 24, 27, 27, 22, 26, 29, 30, 26, 26, 28, 30, 27, 28, 31, 31, 29, 31, 31, 33, 31, 28, 31

OFFSET

1,2

REFERENCES

KEYWORD

nonn

AUTHOR

Clark Kimberling ([email protected])

STATUS

approved