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A258071 Nonnegative integers that can be computed using exactly ten 10's and the four basic arithmetic operations {+, -, *, /}.

%I A258071 #14 Aug 31 2015 20:34:14
%S A258071 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,
%T A258071 26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,
%U A258071 49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67
%N A258071 Nonnegative integers that can be computed using exactly ten 10's and the four basic arithmetic operations {+, -, *, /}.
%C A258071 The smallest non-computable number here is 443. The largest computable number here is 10^10 = 10000000000.
%H A258071 Alois P. Heinz, <a href="/A258071/b258071.txt">Table of n, a(n) for n = 1..15945</a>
%p A258071 f:= proc(n) f(n):= `if`(n=1, {10}, {seq(seq(seq([x+y, x-y, x*y,
%p A258071       `if`(y=0, [][], x/y)][], y=f(n-j)), x=f(j)), j=1..n-1)})
%p A258071     end:
%p A258071 sort([select(z->z>=0 and is(z, integer), f(10))[]])[];
%Y A258071 Cf. A171826, A171827, A171828, A171829, A258068, A258069, A258070.
%Y A258071 Cf. A182002, A258097.
%K A258071 nonn,look,fini,full
%O A258071 1,3
%A A258071 _Alois P. Heinz_, May 18 2015