The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A013705 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A013705

Decimal expansion of 4*Sum_{k=1..500000} (-1)^(k-1)/(2k-1).
(history; published version)

#32 by Alois P. Heinz at Tue Mar 03 09:50:03 EST 2020

STATUS

editing

approved

#31 by Alois P. Heinz at Tue Mar 03 09:49:59 EST 2020

DATA

3, 1, 4, 1, 5, 9, 0, 6, 5, 3, 5, 8, 9, 7, 9, 3, 2, 4, 0, 4, 6, 2, 6, 4, 3, 3, 8, 3, 2, 6, 9, 5, 0, 2, 8, 8, 4, 1, 9, 7, 2, 9, 1, 3, 9, 9, 3, 7, 5, 1, 0, 3, 0, 5, 0, 9, 7, 4, 9, 4, 4, 6, 9, 3, 3, 4, 9, 8, 1, 6, 4, 0, 0, 8, 8, 0, 6, 7, 8, 9, 9, 9, 0, 2, 6, 7, 5, 6, 7, 8, 7, 3, 0, 3, 3, 3, 4, 0, 4, 3, 6, 9, 6, 9, 5

STATUS

approved

editing

#30 by Susanna Cuyler at Sun Mar 11 17:18:04 EDT 2018

STATUS

proposed

approved

#29 by Michel Marcus at Sun Mar 11 13:42:10 EDT 2018

STATUS

editing

proposed

Discussion

Sun Mar 11

13:51

Jon E. Schoenfield: Fine with me (but I don't [yet] know PARI) ...

#28 by Michel Marcus at Sun Mar 11 13:41:56 EDT 2018

PROG

(PARI) 4*sum(k=1, 500000, (-1.)^(k-1)/(2*k-1)) \\ Michel Marcus, Mar 11 2018

STATUS

proposed

editing

Discussion

Sun Mar 11

13:42

Michel Marcus: ok ?

#27 by Jon E. Schoenfield at Sun Mar 11 13:36:50 EDT 2018

STATUS

editing

proposed

#26 by Jon E. Schoenfield at Sun Mar 11 13:36:23 EDT 2018

DATA

EXTENSIONS

a(78)-a(80) corrected and more digits from Jon E. Schoenfield, Mar 11 2018

#25 by Jon E. Schoenfield at Sun Mar 11 13:35:05 EDT 2018

COMMENTS

This result arises because the sum is Pi - 2*10^-6 + 2*10^-18 - 10^-29 + 122*10^-42 - ... - Jon E. Schoenfield, Mar 11 2018

STATUS

approved

editing

#24 by Peter Luschny at Fri Feb 06 10:47:02 EST 2015

STATUS

reviewed

approved

#23 by Joerg Arndt at Fri Feb 06 10:32:26 EST 2015

STATUS

proposed

reviewed