%I A048986
%S A048986 1,2,3,31,5,11,7,179,29,31,11,43,13,23,29,12007,17,47,19,251,31,43,23,
%T A048986 499,4091,4091,127,4091,29,127,31,1564237,59,4079,47,367,37,83,61,
%U A048986 383,41,179,43,499,4091,4091,47,683,127,173,113,173,53,191,4091
%N A048986 Home primes in base 2: primes reached when you start with n and (working 
               in base 2) concatenate its prime factors (A048985); repeat until 
               a prime is reached (or -1 if no prime is ever reached). Answer is 
               written in base 10.
%C A048986 a(1) = 1 by convention.
%H A048986 P. De Geest, <a href="http://www.worldofnumbers.com/topic1.htm">Home 
               Primes</a>
%e A048986 4 = 2*2 -> 1010 = 10 = 2*5 ->10101 = 21 = 3*7 -> 11111 = 31 = prime.
%Y A048986 Cf. A048985, A037274, A049065.
%Y A048986 Sequence in context: A137981 A110351 A088115 this_sequence A093712 A035514 
               A114009
%Y A048986 Adjacent sequences: A048983 A048984 A048985 this_sequence A048987 A048988 
               A048989
%K A048986 nonn,base,nice
%O A048986 1,2
%A A048986 Michael B Greenwald (mbgreen(AT)central.cis.upenn.edu)