Revision History for A098471
(Underlined text is an addition;
strikethrough text is a deletion.)
Showing all changes.
|
| |
| |
| |
|
|
#6 by Jon E. Schoenfield at Sat Mar 21 06:11:14 EDT 2015
| |
| |
| |
|
|
#5 by Jon E. Schoenfield at Sat Mar 21 06:11:12 EDT 2015
|
|
| MATHEMATICA
|
mexp = {the list in A000043}; f[n_] := Block[{k = 1, mp = 2^mexp[[n]] - 1}, While[ !PrimeQ[mp*2^k + 1] && k < 10000, k++ ]; If[k == 10000, 0, k]]; Do[ Print[ f[n]], {n, 22}] (from }] (* _Robert G. Wilson v _, Sep 13 2004) *)
|
|
| EXTENSIONS
|
a(18) - )-a(22) from _Robert G. Wilson v _, Sep 13 2004
|
|
| STATUS
|
approved
editing
|
| |
| |
|
|
#4 by Russ Cox at Sat Mar 31 13:22:03 EDT 2012
|
|
| AUTHOR
|
_Pierre CAMI (pierre-cami(AT)bbox.fr), _, Sep 09 2004
|
| |
|
|
Discussion
|
| Sat Mar 31
| 13:22
| OEIS Server: https://oeis.org/edit/global/885
|
| |
| |
|
|
#3 by Charles R Greathouse IV at Thu Dec 01 11:14:14 EST 2011
|
|
| AUTHOR
|
Pierre CAMI (pierrecamipierre-cami(AT)tele2bbox.fr), Sep 09 2004
|
| |
|
|
Discussion
|
| Thu Dec 01
| 11:14
| OEIS Server: https://oeis.org/edit/global/101
|
| |
| |
|
|
#2 by N. J. A. Sloane at Sun Feb 20 03:00:00 EST 2005
|
|
| MATHEMATICA
|
mexp = {the list in A000043}; f[n_] := Block[{k = 1, mp = 2^mexp[[n]] - 1}, While[ !PrimeQ[mp*2^k + 1] && k < 10000, k++ ]; If[k == 10000, 0, k]]; Do[ Print[ f[n]], {n, 22}] (from Robert G. Wilson RGWvv Sep 13 2004)
|
|
| KEYWORD
|
nonn,new
nonn
|
|
| EXTENSIONS
|
a(18) - a(22) from Robert G. Wilson RGWvv Sep 13 2004
|
| |
| |
|
|
#1 by N. J. A. Sloane at Wed Sep 22 03:00:00 EDT 2004
|
|
| NAME
|
Least k such that Mersenne-prime(n)*2^k+1 is prime (A000668(n)*2^k+1).
|
|
| DATA
|
1, 2, 8, 2, 12, 864, 4, 10, 8, 72, 18, 38, 2144, 178, 472, 974, 2200, 8128, 4580, 822, 3600, 4100
|
|
| OFFSET
|
1,2
|
|
| MATHEMATICA
|
mexp = {the list in A000043}; f[n_] := Block[{k = 1, mp = 2^mexp[[n]] - 1}, While[ !PrimeQ[mp*2^k + 1] && k < 10000, k++ ]; If[k == 10000, 0, k]]; Do[ Print[ f[n]], {n, 22}] (from RGWv Sep 13 2004)
|
|
| CROSSREFS
|
Cf. A098472.
|
|
| KEYWORD
|
nonn,new
|
|
| AUTHOR
|
Pierre CAMI (pierrecami(AT)tele2.fr), Sep 09 2004
|
|
| EXTENSIONS
|
a(18) - a(22) from RGWv Sep 13 2004
|
|
| STATUS
|
approved
|
| |
| |
|
|
