Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #13 Jan 27 2022 08:01:36
%S 1,1,5,1,12,1,24,2,47,2,53,1,70,1
%N Number of terms in A145848 with exactly 2n decimal digits.
%C It is shown by I. Bernshtein, see link, that a(2n+1)>=1 and 1<=a(2n)<=2. Thanks to Tanya Khovanova for this link.
%H I. Bernshtein, <a href="http://kvant.mccme.ru/1978/06/resheniya_zadachnika_kvanta_ma.htm">Solution of problem M460</a>.
%Y Cf. A145848, A146991.
%K more,nonn,base
%O 1,3
%A _Zak Seidov_, Nov 04 2008
%E Definition, comment, and a(11) corrected, and a(12)-a(14) added, by _Jon E. Schoenfield_, Nov 19 2008