|
| |
|
|
A138646
|
|
Primes p such that 5*p-2 is composite.
|
|
0
| |
|
|
2, 7, 13, 19, 29, 31, 37, 41, 43, 61, 67, 73, 79, 83, 97, 103, 107, 109, 127, 139, 151, 157, 163, 167, 179, 181, 193, 199, 211, 223, 227, 229, 241, 251, 263, 269, 271, 277, 281, 283, 293, 307, 313, 331, 337, 349, 353, 359, 367, 373, 379, 389, 397, 409, 419
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
EXAMPLE
| 5*2-2=8, 5*7-2=33, 5*13-2=63,...
|
|
|
MATHEMATICA
| a={}; Do[p=Prime[n]; If[ !PrimeQ[5*p-2], AppendTo[a, p]], {n, 8^2}]; a
|
|
|
CROSSREFS
| Sequence in context: A020623 A109346 A140550 * A118755 A156012 A106011
Adjacent sequences: A138643 A138644 A138645 * A138647 A138648 A138649
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Vladimir Orlovsky (4vladimir(AT)gmail.com), May 15 2008
|
|
|
EXTENSIONS
| More terms from Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Apr 01 2010
|
| |
|
|
