OFFSET
1,1
COMMENTS
a(n) is congruent 3 mod 4.
The next term (if it exists) corresponds to some n>23, so it has more than 11 million digits. [R. J. Mathar, Aug 23 2010]
CROSSREFS
KEYWORD
nonn,bref
AUTHOR
Giovanni Teofilatto, Mar 14 2010
EXTENSIONS
Entries checked. - R. J. Mathar, Aug 23 2010
STATUS
approved