|
| |
|
|
A107414
|
|
Least number k such that k*p(j)*p(j+1) - 1 and k*p(j)*p(j+1) + 1 are twin primes with p(j) and p(j+1) odd twin primes.
|
|
0
| |
|
|
2, 12, 6, 60, 78, 336, 18, 216, 96, 144, 120, 18, 510, 516, 336, 66, 60, 420, 144, 570, 570, 270, 120, 156, 54, 102, 102, 540, 504, 48, 582, 264, 210, 156, 156, 78, 30, 282, 354, 240, 156, 372, 24, 102, 150, 180, 306, 690, 120, 210, 204, 252, 144, 156, 240, 156
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
EXAMPLE
| 2*3*5=30 29 and 31 twin primes, 3 and 5 fist odd twin primes so k(1)=2
12*5*7=420 419 and 421 twin primes, 5 and 7 second odd twin primes so k(2)=12
6*11*13=858 857 and 859 twin primes, 11 and 13 third odd twin primes k(3)=6
|
|
|
CROSSREFS
| Sequence in context: A079080 A035877 A086494 * A133437 A014964 A173181
Adjacent sequences: A107411 A107412 A107413 * A107415 A107416 A107417
|
|
|
KEYWORD
| easy,nonn
|
|
|
AUTHOR
| Pierre CAMI (pierre-cami(AT)bbox.fr), May 26 2005
|
| |
|
|
