Search: id:A002147
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%I A002147 M4402 N1857
%S A002147 7,31,127,487,1423,1303,2143,2647,4447,5527,5647,6703,5503,11383,
%T A002147 8863,13687,13183,12007,22807,18127,21487,22303,29863,25303,27127
%N A002147 Largest prime == 7 mod 8 with class number 2n+1.
%C A002147 Apr 14 2008: David Broadhurst says: I computed class numbers for prime 
               discriminants with |D| < 10^9, but stopped when the first case with 
               |D| > 5*10^8 was observed. That factor of 2 seems to me to be a reasonable 
               margin of error, when you look at the pattern of what is included.
%D A002147 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A002147 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A002147 R. B. Lakein and S. Kuroda, Tables of class numbers h(-p) for fields 
               Q(sqrt(-p)), p<= 465071, Math. Comp., 24 (1970), 491-492.
%H A002147 David Broadhurst, <a href="b002147.txt">Table of n, a(n) for n=0..2246</
               a> (conjectural; see comment)
%Y A002147 Cf. A002146.
%Y A002147 Sequence in context: A036280 A153005 A056909 this_sequence A083420 A036282 
               A033474
%Y A002147 Adjacent sequences: A002144 A002145 A002146 this_sequence A002148 A002149 
               A002150
%K A002147 nonn
%O A002147 0,1
%A A002147 N. J. A. Sloane (njas(AT)research.att.com).

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