OFFSET
1,1
COMMENTS
There are no terms of the forms q-1 and 2q with q prime.
Are there infinitely many the terms m = 3q with q prime?
EXAMPLE
For 2^15 - 1 = 7*31*151, 30/15 = 2 and 150/15 = 10, so 15 is a term.
For 2^16 - 1 = 3*5*17*257, 16/16 = 1 is odd, so 16 is not a term.
CROSSREFS
KEYWORD
nonn
AUTHOR
Thomas Ordowski, Sep 11 2017
EXTENSIONS
a(13)-a(48) from Max Alekseyev, Sep 11 2017
STATUS
approved