OFFSET
1,1
COMMENTS
Contains no primes q and no doubled primes 2q.
Are there infinitely many such numbers?
LINKS
Max Alekseyev, Table of n, a(n) for n = 1..829
CROSSREFS
KEYWORD
nonn
AUTHOR
Thomas Ordowski, Sep 11 2017
EXTENSIONS
Terms a(19) onward from Max Alekseyev, Sep 13 2017
STATUS
approved