|
|
A138242
|
|
Prime numbers k such that 12*k - 1, 12*k + 1 are twin primes.
|
|
3
|
|
|
5, 19, 29, 139, 149, 271, 281, 379, 569, 601, 691, 719, 751, 839, 1009, 1021, 1051, 1499, 1511, 1601, 1619, 1709, 1801, 2161, 2381, 2539, 2711, 2819, 2851, 3001, 3109, 3221, 3229, 3319, 3449, 3929, 4111, 4129, 4139, 4241, 4261, 4339, 4871, 4909, 4969
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
EXAMPLE
|
5*12 = 60 - 1 = 59 (prime), 5*12 = 60 + 1 = 61 (prime).
|
|
MATHEMATICA
|
a=12; Select[Prime[Range[250]], PrimeQ[a*#-1]&&PrimeQ[a*#+1] &]
Select[Prime[Range[700]], AllTrue[12#+{1, -1}, PrimeQ]&] (* The program uses the AllTrue function from Mathematica version 10 *) (* Harvey P. Dale, Jan 11 2017 *)
|
|
PROG
|
(Magma) [n: n in [0..1000] |IsPrime(n) and IsPrime(12*n-1)and IsPrime(12*n+1)] // Vincenzo Librandi, Nov 24 2010
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|