1,1
19 and 191 are found in the Mersenne prime 8191.
Sequence in context: A019021 A110505 A009128 this_sequence A138862 A080173 A023266
Adjacent sequences: A053645 A053646 A053647 this_sequence A053649 A053650 A053651
nonn,base
Enoch Haga (Enokh(AT)comcast.net), Feb 19 2000
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