|
Search: id:A098556
|
|
|
| A098556 |
|
Least k such that k*Mersenne-prime(n)+1 is prime. |
|
+0
3
|
|
| 2, 4, 10, 4, 46, 12, 16, 46, 52, 136, 166, 114, 336, 154, 1474, 156, 1086, 1816, 2010, 9436, 1746, 3426, 6238, 40138, 858, 4018, 17262, 15418
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
MATHEMATICA
|
mexp = {the list in A000043}; f[n_] := Block[{k = 2, mp = 2^mexp[[n]] - 1}, While[ !PrimeQ[mp*k + 1] && k < 10000, k += 2 ]; If[k == 10000, 0, k]]; Do[ Print[ f[n]], {n, 21}] (from Robert G. Wilson v Sep 17 2004)
|
|
CROSSREFS
|
Cf. A000043, A000668, A098555.
Sequence in context: A065299 A128942 A135445 this_sequence A159585 A130334 A124108
Adjacent sequences: A098553 A098554 A098555 this_sequence A098557 A098558 A098559
|
|
KEYWORD
|
hard,nonn
|
|
AUTHOR
|
Pierre CAMI (pierrecami(AT)tele2.fr), Sep 14 2004
|
|
EXTENSIONS
|
a(21)=1746 corrected, other terms verified, a(23)-a(28) extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Apr 16 2009
|
|
|
Search completed in 0.002 seconds
|
