OFFSET
1,1
COMMENTS
Is the sequence infinite?
All terms listed are of the form == 7 (mod 8). Is there a reason for this phenomenon?
Conjecture: The numbers 2^k-1 for k > 2 are terms. - Chai Wah Wu, Sep 02 2021
CROSSREFS
KEYWORD
nonn,more,base
AUTHOR
Vladimir Shevelev, May 13 2010
EXTENSIONS
a(20)-a(22) from Chai Wah Wu, Sep 06 2021
STATUS
approved