OFFSET
1,1
COMMENTS
The fifth and sixth terms are both cubes, exploiting the simple binomial expansion as (m)(m)^3=(m^3)(3m^3)(3m^3)(m^3) for much of their status. - James G. Merickel, Dec 19 2009
The first base in which the fifth term is 4-palindromic is 209. - James G. Merickel, Dec 18 2009
a(10) <= 27653197824000, a(11) <= 27653197824000, a(12) <= 575100098496000, a(13) <= 1733189185728000, a(14) <= 1733189185728000, a(15) <= 8400090327552000. - Hiroaki Yamanouchi, Sep 24 2014
EXAMPLE
a(2)=624 is 4444 in base 5 and 1551 in base 7.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
James G. Merickel, Dec 16 2009
EXTENSIONS
a(5)-a(6) from James G. Merickel, Dec 19 2009
a(7)-a(9) from Hiroaki Yamanouchi, Sep 24 2014
STATUS
approved