The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A354332

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

A354332

a(n) is the numerator of Sum_{k=0..n} (-1)^k / (2*k+1)!.
(history; published version)

#13 by Michael De Vlieger at Tue May 24 12:55:01 EDT 2022

STATUS

reviewed

approved

#12 by Michel Marcus at Tue May 24 12:34:50 EDT 2022

STATUS

proposed

reviewed

#11 by Chai Wah Wu at Tue May 24 11:20:18 EDT 2022

STATUS

editing

proposed

#10 by Chai Wah Wu at Tue May 24 11:20:11 EDT 2022

PROG

(Python)

from fractions import Fraction

from math import factorial

def A354332(n): return sum(Fraction(-1 if k % 2 else 1, factorial(2*k+1)) for k in range(n+1)).numerator # Chai Wah Wu, May 24 2022

STATUS

approved

editing

#9 by Hugo Pfoertner at Tue May 24 10:35:46 EDT 2022

STATUS

reviewed

approved

#8 by Joerg Arndt at Tue May 24 10:02:39 EDT 2022

STATUS

proposed

reviewed

#7 by Michel Marcus at Tue May 24 09:11:15 EDT 2022

STATUS

editing

proposed

#6 by Michel Marcus at Tue May 24 09:11:12 EDT 2022

PROG

(PARI) a(n) = numerator(sum(k=0, n, (-1)^k/(2*k+1)!)); \\ Michel Marcus, May 24 2022

STATUS

proposed

editing

#5 by Ilya Gutkovskiy at Tue May 24 09:04:24 EDT 2022

STATUS

editing

proposed

#4 by Ilya Gutkovskiy at Tue May 24 07:48:15 EDT 2022

CROSSREFS

Cf. A009445, A049469, A053557, A061354, A103816, A120265, A143382, A354211, A354298, A354333 (denominators), A354334.