OFFSET
1,1
COMMENTS
A prime triple is a set of three prime numbers of the form (p, p+2, p+6) or (p, p+4, p+6).
Initial members p of prime triples of the form (p, p+4, p+6) are congruent to 7 or 13 (mod 30).
Also called prime triples of the second kind.
LINKS
C. K. Caldwell, Top Twenty page, Triplet
Eric Weisstein's World of Mathematics, Prime Triplet
Wikipedia, Prime triple
FORMULA
a(3*n-2) = A022005(n).
EXAMPLE
The table starts:
7, 11, 13;
13, 17, 19;
37, 41, 43;
...
MATHEMATICA
Prime@ Range[#, # + 2] &@ PrimePi@ Select[Prime@ Range@ 240, Times @@ Boole@ PrimeQ[# + {4, 6}] > 0 &] // Flatten (* Michael De Vlieger, Aug 02 2016 *)
PROG
(Magma) &cat[[p, p+4, p+6]: p in PrimesUpTo(1423) | p mod 30 in {7, 13} and IsPrime(p+4) and IsPrime(p+6)];
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Arkadiusz Wesolowski, Jul 31 2016
STATUS
approved