The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A277131 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A277131

Magic numbers of anti-Mackay icosahedra.
(history; published version)

#21 by Joerg Arndt at Tue Oct 25 08:10:52 EDT 2016

STATUS

proposed

approved

#20 by Colin Barker at Tue Oct 25 07:49:33 EDT 2016

STATUS

editing

proposed

#19 by Colin Barker at Tue Oct 25 07:49:19 EDT 2016

LINKS

Colin Barker, <a href="/A277131/b277131.txt">Table of n, a(n) for n = 2..1000</a>

PROG

(PARI) Vec(x^2*(45-53*x+41*x^2-13*x^3)/(1-x)^4 + O(x^3650)) \\ Colin Barker, Oct 01 2016

STATUS

approved

editing

#18 by N. J. A. Sloane at Mon Oct 24 04:31:45 EDT 2016

STATUS

proposed

approved

#17 by Wesley Ivan Hurt at Fri Oct 07 15:23:22 EDT 2016

STATUS

editing

proposed

#16 by Wesley Ivan Hurt at Fri Oct 07 15:23:04 EDT 2016

MAPLE

A277131:=n->11-(19*n)/3+5*n^2+(10*n^3)/3: seq(A277131(n), n=2..50); # Wesley Ivan Hurt, Oct 07 2016

STATUS

proposed

editing

#15 by Felix Fröhlich at Thu Oct 06 08:58:08 EDT 2016

STATUS

editing

proposed

#14 by Felix Fröhlich at Thu Oct 06 08:56:33 EDT 2016

PROG

(PARI) a005902a(n) = (2*n+1) * (5*n^2+5*n+3) / 3 - 10*(n-1)

a008592(n) = 10*n

a(n) = a005902(n) - a008592(n-1)

STATUS

proposed

editing

Discussion

Thu Oct 06

08:57

Felix Fröhlich: Okay, done.

#13 by Michael De Vlieger at Sun Oct 02 22:55:47 EDT 2016

STATUS

editing

proposed

Discussion

Thu Oct 06

01:25

Michel Marcus: I wonder if the 1st pari program could be more simply written as a one-liner  wie so a(n) =  (2*n+1) * (5*n^2+5*n+3) / 3 - 10*(n-1) ?

#12 by Michael De Vlieger at Sun Oct 02 22:55:40 EDT 2016

MATHEMATICA

DeleteCases[CoefficientList[Series[x^2*(45 - 53 x + 41 x^2 - 13 x^3)/(1 - x)^4, {x, 0, 39}], x], 0] (* Michael De Vlieger, Oct 02 2016 *)

STATUS

proposed

editing