The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A056126

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A056126

a(n) = n*(n + 17)/2.
(history; published version)

#47 by Charles R Greathouse IV at Thu Sep 08 08:45:01 EDT 2022

PROG

(MAGMAMagma) [n*(n+17)/2: n in [0..50]]; // G. C. Greubel, Jan 19 2020

Discussion

Thu Sep 08

08:45

OEIS Server: https://oeis.org/edit/global/2944

#46 by Michel Marcus at Sun Jan 10 02:44:07 EST 2021

STATUS

reviewed

approved

#45 by Joerg Arndt at Sun Jan 10 02:43:13 EST 2021

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proposed

reviewed

#44 by Joerg Arndt at Sun Jan 10 02:43:09 EST 2021

STATUS

editing

proposed

#43 by Joerg Arndt at Sun Jan 10 02:43:06 EST 2021

MATHEMATICA

((2*Range[0, 50] + 17)^2 - 289)/8 (* G. C. Greubel, Jan 19 2020 *)

STATUS

proposed

editing

#42 by Amiram Eldar at Sun Jan 10 01:37:15 EST 2021

STATUS

editing

proposed

#41 by Amiram Eldar at Sun Jan 10 01:29:12 EST 2021

COMMENTS

a(n) = A126890(n,8) for n>7. - Reinhard Zumkeller, Dec 30 2006

FORMULA

a(n) = A126890(n,8) for n>7. - Reinhard Zumkeller, Dec 30 2006

#40 by Amiram Eldar at Sun Jan 10 01:28:54 EST 2021

FORMULA

From Amiram Eldar, Jan 10 2021: (Start)

Sum_{n>=1} 1/a(n) = 2*A001008(17)/(17*A002805(17)) = 42142223/104144040.

Sum_{n>=1} (-1)^(n+1)/a(n) = 4*log(2)/17 - 1768477/20828808. (End)

CROSSREFS

Cf. A001008, A002805, A098849, A120071, A132760, A132761, A132765.

STATUS

approved

editing

#39 by Susanna Cuyler at Sun Jan 19 20:37:10 EST 2020

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proposed

approved

#38 by G. C. Greubel at Sun Jan 19 17:01:10 EST 2020

STATUS

editing

proposed