|
Search: id:A138697
|
|
|
| A138697 |
|
Primes p such that 42*p-1, 42*p+1 and 48*p-1, 48*p+1 are twin primes. |
|
+0
6
|
|
| 31, 331, 2971, 4421, 4861, 5309, 5441, 20431, 22381, 23459, 28151, 33911, 37061, 37699, 47491, 66449, 75821, 82799, 83701, 86131, 91961
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
EXAMPLE
|
42*31-1=1301, 42*31+1=1303; 48*31-1=1487, 48*31+1=1489; ...
|
|
MATHEMATICA
|
a=42; b=48; Select[Prime[Range[14^4]], PrimeQ[a*#-1]&&PrimeQ[a*#+1]&&PrimeQ[b*#-1]&&PrimeQ[b*#+1]&]
|
|
CROSSREFS
|
Sequence in context: A142382 A137318 A029813 this_sequence A033175 A123568 A111675
Adjacent sequences: A138694 A138695 A138696 this_sequence A138698 A138699 A138700
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Vladimir Orlovsky (4vladimir(AT)gmail.com), May 15 2008
|
|
|
Search completed in 0.002 seconds
|
