OFFSET
1,1
COMMENTS
The highly composite numbers are listed in A068507, but their growth is such that one cannot list the terms beyond A002182(362), corresponding to a(17), in the DATA section.
a(22) > 779674, if it exists. - Amiram Eldar, Dec 03 2020
FORMULA
PROG
(PARI) select( x->ispseudoprime(x-1)&&ispseudoprime(x+1), A2182, 1) \\ assuming A2182 holds enough terms of A002182. - M. F. Hasler, Jun 23 2019
CROSSREFS
KEYWORD
nonn,more
AUTHOR
M. F. Hasler, Jun 23 2019
EXTENSIONS
a(21) from Daniel Suteu, Jun 27 2019 (obtained from A. Flammenkamp's data)
STATUS
approved