OFFSET
1,1
COMMENTS
Sequence A181490 lists the exponents k, sequences A181491 and A181493 the corresponding lesser twin prime and their average.
a(5) > 3 * 2^3000 + 1. - Max Z. Scialabba, Dec 24 2023
FORMULA
MATHEMATICA
Select[3 2^Range[100]+1, And@@PrimeQ[{#, #-2}]&] (* Harvey P. Dale, Jun 19 2013 *)
PROG
(PARI) for( k=1, 999, ispseudoprime(3<<k-1)|next; ispseudoprime(3<<k+1)|next; print1(3<<k+1, ", "))
CROSSREFS
KEYWORD
nonn
AUTHOR
M. F. Hasler, Oct 30 2010
STATUS
approved