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a(n+1) = a(n) converted to base 5 from base 2 (written in base 10).
2

%I #17 Oct 23 2016 02:46:48

%S 2,5,26,755,2050631,119177296890656,171894935774803164578253225003125,

%T 616543721977678583680403510514050763393641034556349185528171544036914081901

%N a(n+1) = a(n) converted to base 5 from base 2 (written in base 10).

%C The next term (a(9)) has 174 digits. - _Harvey P. Dale_, Aug 12 2012

%H John Cerkan, <a href="/A023362/b023362.txt">Table of n, a(n) for n = 1..11</a>

%t NestList[FromDigits[IntegerDigits[#,2],5]&,2,10] (* _Harvey P. Dale_, Aug 12 2012 *)

%K nonn,base

%O 1,1

%A _David W. Wilson_

%E One more term (a(8)) added by _Harvey P. Dale_, Aug 12 2012