OFFSET
1,1
COMMENTS
All terms are divisible by 3. - Robert Israel, Jun 27 2024
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
EXAMPLE
3 is a term: 3*2 + 1 = 7 and 3*6 + 1 = 19 are primes congruent to 1 (mod 6). - R. J. Mathar, Apr 16 2010
MAPLE
select(k -> isprime(2*k+1) and isprime(6*k+1), 3*[$1..1000]); # Robert Israel, Jun 27 2024
MATHEMATICA
Select[Range[1000], With[{c={2, 6}#+1}, AllTrue[c, PrimeQ]&&AllTrue[(c-1)/6, IntegerQ]&]] (* Harvey P. Dale, Aug 08 2022 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Mar 07 2010
EXTENSIONS
More terms from R. J. Mathar, Apr 16 2010
STATUS
approved