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%I #3 Feb 09 2013 14:15:53
%S 17,105,289,294,902,903,904,905,918,919,5491,5492,5493,5508,5525,
%T 16905,16920,16921,270354,271665,271700,271701,275205,275256,3342391,
%U 3342392,3342405,3342408,3342409,3342421,3342422,3342423,3342424,3342425,3342438,3342439
%N Values of n for which A095777(n) is 16 (those terms which are expressible in decimal digits for bases 2 through 17, but not for base 18).
%e a(5)=902 because 902 when expressed in successive bases starting at 2 will produce its first non-decimal digit at base 18. Like so: 1110000110, 1020102, 32012, 12102, 4102, 2426, 1606, 1212, 902, 750, 632, 545, 486, 402, 386, 321. In base 18, 902 is 2E2.
%p S := []; for n from 1 to 15000 do; if 1>0 then; ct := 0; ok := true; b := 2; if (n>9) then; while ok=true do; L := convert(n, base, b); for e in L while ok=true do; if (e > 9) then ok:=false; fi; od; if ok=true then; ct := ct + 1; b := b + 1; fi; od; fi; if ct=16 then S := [op(S), n]; fi; fi; od; S;
%t b18Q[n_]:=Module[{idn=Table[IntegerDigits[n,b],{b,2,18}]},Max[Flatten[Most[ idn]]]<10 && Max[Last[idn]]>9]; Select[Range[50000],b18Q] (* _Harvey P. Dale_, Feb 09 2013 *)
%Y Cf. A095777.
%K base,nonn
%O 1,1
%A Chuck Seggelin (seqfan(AT)plastereddragon.com), Jun 05 2004
%E More terms from _Harvey P. Dale_, Feb 09 2013
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