|
|
A289850
|
|
Primes of the form k!2-4, where k!2 is the double factorial number (A006852).
|
|
1
|
|
|
11, 101, 941, 10391, 135131, 2027021, 654729071, 7905853580621, 221643095476699771871, 79777941814291672401518892224505807820921910393015244140621, 6462013286957625464523030270184970433494674741834234775390621
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
MATHEMATICA
|
MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
Select[Table[MultiFactorial[i, 2] - 4, {i, 4, 100}], PrimeQ[#]&]
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|