Search: id:A002148
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%I A002148 M3164 N1282
%S A002148 3,59,131,251,419,659,1019,971,1091,2099,1931,1811,3851,3299,2939,3251,
%T A002148 4091,4259,8147,5099,9467,6299,6971,8291,8819,14771,22619,9539,13331,
%U A002148 18443,11171,16979,12011,13859,16931,17939,28211,19211,24251,20411
%N A002148 Smallest prime p==3 (mod 8) such that Q(sqrt(-p)) has class number 2n+1.
%D A002148 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A002148 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A002148 D. A. Buell, Binary Quadratic Forms. Springer-Verlag, NY, 1989, pp. 224-241.
%D A002148 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 A002148 David Broadhurst and T. D. Noe, <a href="b002148.txt">Table of n, a(n) 
               for n=0..10399</a>
%t A002148 (* First do <<NumberTheory`NumberTheoryFunctions` *) a=Table[0, {101}]; 
               Do[If[PrimeQ[m], c=ClassNumber[ -m]; If[c<102&&a[[c]]==0, a[[c]]=m]], 
               {m, 3, 10000, 8}]; Table[a[[n]], {n, 1, 101, 2}]
%Y A002148 Cf. A002143 (class numbers), A002149, A003173, A006203.
%Y A002148 Sequence in context: A139874 A155032 A107212 this_sequence A057175 A142642 
               A062629
%Y A002148 Adjacent sequences: A002145 A002146 A002147 this_sequence A002149 A002150 
               A002151
%K A002148 nonn
%O A002148 0,1
%A A002148 N. J. A. Sloane (njas(AT)research.att.com) and Mira Bernstein (mira(AT)math.berkeley.edu)
%E A002148 More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Apr 17 2001
%E A002148 Edited by Dean Hickerson (dean.hickerson(AT)yahoo.com), Mar 17 2003

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