

A171703


The first nfold intrinsically 4palindromic number (represented in base ten).


24




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 4palindromic 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


LINKS

Table of n, a(n) for n=1..9.


EXAMPLE

a(2)=624 is 4444 in base 5 and 1551 in base 7.


CROSSREFS

Cf. A171701, A171702, A171704, A171705, A171706, A171740, A171741, A171742.
Sequence in context: A139107 A226552 A277232 * A085530 A188423 A158881
Adjacent sequences: A171700 A171701 A171702 * A171704 A171705 A171706


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



