%I A050681
%S A050681 8,14,16,19,21,23,37,57
%N A050681 Positions of 4's in A050677.
%D A050681 M. Fleuren, Smarandache Factors and Reverse Factors, Smarandache Notions 
               Journal, 10 (No. 1-2-3, Spring 1999), 5-38.
%H A050681 P. De Geest, <a href="http://www.worldofnumbers.com/revfact.htm">Reversed 
               Smarandache Concatenated Numbers, Prime factors from n down to 1</
               a>
%H A050681 M. L. Perez et al., eds., <a href="http://www.gallup.unm.edu/~smarandache/
               ">Smarandache Notions Journal</a>
%H A050681 C. Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_008.htm">
               Primes by Listing</a>
%H A050681 M. Fleuren, <a href="http://www.gallup.unm.edu/~smarandache/michafleuren.htm">
               Factors and primes of Smarandache sequences</a>.
%H A050681 M. Fleuren, <a href="http://www.gallup.unm.edu/~smarandache/micha.txt">
               Smarandache Factors and Reverse factors</a>
%Y A050681 Cf. A000422, A050677, A046463.
%Y A050681 Sequence in context: A092537 A082772 A103338 this_sequence A084021 A114456 
               A138666
%Y A050681 Adjacent sequences: A050678 A050679 A050680 this_sequence A050682 A050683 
               A050684
%K A050681 nonn,base,hard
%O A050681 0,1
%A A050681 Patrick De Geest (pdg(AT)worldofnumbers.com), Aug 15 1999.