The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A241189 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A241189

Numerator of Sum_{i=1..n} 1/(prime(i)*prime(i+1)).
(history; published version)

#12 by Harvey P. Dale at Tue Mar 14 15:02:01 EDT 2023

STATUS

editing

approved

#11 by Harvey P. Dale at Tue Mar 14 15:01:59 EDT 2023

MATHEMATICA

Accumulate[1/#&/@(Times@@@Partition[Prime[Range[25]], 2, 1])]//Numerator (* Harvey P. Dale, Mar 14 2023 *)

STATUS

approved

editing

#10 by N. J. A. Sloane at Wed Jan 27 20:55:54 EST 2016

STATUS

proposed

approved

#9 by Michael De Vlieger at Wed Jan 27 19:58:17 EST 2016

STATUS

editing

proposed

#8 by Michael De Vlieger at Wed Jan 27 19:58:11 EST 2016

NAME

Numerator of Sum_{i=1..n} 1/((prime(i)*prime(i+1)).

COMMENTS

a(371) has 1002 decimal digits. - Michael De Vlieger, Jan 27 2016

LINKS

Michael De Vlieger, <a href="/A241189/b241189.txt">Table of n, a(n) for n = 1..370</a>

MATHEMATICA

Table[Numerator@ Sum[1/(Prime[i + 1] Prime@ i), {i, n}], {n, 20}] (* Michael De Vlieger, Jan 27 2016 *)

STATUS

approved

editing

#7 by N. J. A. Sloane at Fri Apr 25 23:10:58 EDT 2014

STATUS

editing

approved

#6 by N. J. A. Sloane at Fri Apr 25 23:10:56 EDT 2014

AUTHOR

N. J. A. Sloane, Apr 25 2014, based on a suggestion from _Tim Timothy Varghese_.

STATUS

approved

editing

#5 by N. J. A. Sloane at Fri Apr 25 23:10:10 EDT 2014

STATUS

editing

approved

#4 by N. J. A. Sloane at Fri Apr 25 23:10:05 EDT 2014

CROSSREFS

See also A061015/A061742, A115963/A115964.

STATUS

approved

editing

#3 by N. J. A. Sloane at Fri Apr 25 22:51:09 EDT 2014

STATUS

editing

approved