A068862 Numbers n such that A068861(n) = n.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 31, 48, 51, 68, 71, 88, 91, 108, 307, 309, 511, 688, 711, 888, 911, 1088, 3110, 7111, 10879

Offset: 1

Author

Amarnath Murthy, Mar 13 2002

Keywords

• base
• nonn

Crossrefs

Cf. A068860, A068861.

Programs

Maple

V:= Vector(10^5):
V[1]:= 1: m:= 2:
count:= 1: A[1]:= 1:
L:= [1]:
for n from 2 to 12000 do
  for i from m to 10^5 do
    if V[i] = 0 then
      LL:= convert(i,base,10);
      k:= min(nops(L),nops(LL));
      if not has(LL[1..k] - L[1..k],0) then
        V[i]:= n;
        if i = m then
          for m from m+1 while V[m] <> 0 do od:
        fi;
        if i = n then
           count:= count+1;
           A[count]:= n;
        fi;
        L:= LL;
        break
      fi
    fi
  od;
  if i = 10^5 + 1 then break fi
od:
seq(A[i],i=1..count); # Robert Israel, Mar 03 2016

Extensions

a(19)-a(30) from Robert Israel, Mar 03 2016