|
|
A289754
|
|
Primes of the form k!10-1, where k!10 is the decuple factorial number (A288327).
|
|
1
|
|
|
2, 3, 5, 7, 23, 199, 239999, 7354367, 719999999, 2287853567, 50399999999, 43193222037503, 199094626418687, 17254743876205585224626400657407, 620448401733239439359999999999999999999999999999, 17999257015554062631539656405422901164857242675052543
(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, 10] - 1, {i, 2, 100}], PrimeQ[#]&]
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|