|
|
A099007
|
|
Primes of the form 6n^2 - 2n - 1.
|
|
1
|
|
|
3, 19, 47, 139, 367, 467, 839, 1319, 1699, 1907, 3407, 4003, 4987, 6079, 7703, 10499, 11527, 13159, 16747, 17387, 19379, 23687, 25219, 26003, 30103, 32707, 33599, 35419, 38239, 44203, 50599, 53959, 55103, 57427, 62219, 69767, 72379, 76387
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
All terms are == 3 (mod 4).
|
|
LINKS
|
|
|
EXAMPLE
|
For n = 2 we have 6*2^2 - 2*2 -1 = 19.
|
|
MATHEMATICA
|
|
|
PROG
|
(PARI) for(k=1, 120, if(isprime(p=6*k^2-2*k-1), print1(p, ", ")))
(Magma) [a: n in [0..250] | IsPrime(a) where a is 6*n^2 - 2*n - 1]; // Vincenzo Librandi, Jul 17 2012
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|