|
| |
|
|
A139439
|
|
Numbers n such that primorial(n)/2 + 4 is prime.
|
|
24
| | |
|
|
|
OFFSET
| 1,1
|
|
|
MATHEMATICA
| k=1; a={}; Do[k=k*Prime[n]; If[PrimeQ[k+4], Print[n]; AppendTo[a, n]], {n, 2, 4*10^2}]; a [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Aug 20 2008]
|
|
|
CROSSREFS
| Cf. A067026, A067027, A139439, A139440, A139441, A139442, A139443, A139444, A139445, A139446, A139447, A139448, A139449, A139450, A139451, A139452, A139453, A139454, A139455, A139456, A139457, A103514.
Sequence in context: A134459 A179985 A110705 * A119330 A084644 A189360
Adjacent sequences: A139436 A139437 A139438 * A139440 A139441 A139442
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Artur Jasinski (grafix(AT)csl.pl), Apr 21 2008
|
| |
|
|
