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 A171703 The first n-fold intrinsically 4-palindromic number (represented in base ten). 24
 9, 624, 19040, 30222192, 592704000, 12040481088, 128024064000, 1024192512000, 3456649728000 (list; graph; refs; listen; history; text; internal format)
 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 LINKS 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

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Last modified July 25 23:39 EDT 2021. Contains 346294 sequences. (Running on oeis4.)