%I A117060
%S A117060 1,3,7,15,31,63,127,255,511,8191,16383,32767,65535,262143,524287,
%T A117060 16777215,33554431,134217727,268435455,2147483647,4294967295,8589934591,
%U A117060 17179869183,34359738367,137438953471,549755813887,562949953421311
%N A117060 Mersenne numbers for which the product of the digits is not zero.
%C A117060 These are all the Mersenne nummers for which no digit is 0. The indices 
               of these numbers are : 1,2,3,4,5,6,7,8,9,13,14,15,16,18,19,24,25,
               27,28,31,32,33,34,35,36,37,39,49,51,67,72,76,77,81,86 Are there more? 
               I didn't find any above 2^86-1
%Y A117060 Cf. A000225.
%Y A117060 Sequence in context: A126646 A000225 A123121 this_sequence A057613 A146686 
               A129984
%Y A117060 Adjacent sequences: A117057 A117058 A117059 this_sequence A117061 A117062 
               A117063
%K A117060 base,nonn
%O A117060 0,2
%A A117060 Luc Stevens (lms022(AT)yahoo.com), Apr 16 2006