|
Search: id:A089137
|
|
|
| A089137 |
|
Primes in the progression (n!- m)/m where n advances by 1 and m resets to 1 upon each prime occurrence. |
|
+0
1
|
|
| 5, 23, 59, 719, 5039, 10079, 181439, 907199, 7983359, 479001599, 622702079, 87178291199, 326918591999, 6974263295999, 59281238015999, 1600593426431999, 15205637551103999, 405483668029439999, 5676771352412159999
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
EXAMPLE
|
n=5,m=1 (5!-1)/1 = 119=7*17 not prime m advances to 2.
n=5,m=2 (5!-2)/2 = 118/2 = 59 prime keep it.
|
|
PROGRAM
|
(PARI) nfactm2d2(n, m) = { for(x=1, n, for(k=1, m, y=floor((x!- k)/k); if(isprime(y), print1(y", "); break) ) ) }
|
|
CROSSREFS
|
Sequence in context: A126420 A116581 A093622 this_sequence A098498 A159241 A106956
Adjacent sequences: A089134 A089135 A089136 this_sequence A089138 A089139 A089140
|
|
KEYWORD
|
base,easy,nonn
|
|
AUTHOR
|
Cino Hilliard (hillcino368(AT)gmail.com), Dec 05 2003
|
|
|
Search completed in 0.002 seconds
|
