[seqfan] A061653 corrected!
N. J. A. Sloane
njas at research.att.com
Thu Feb 5 22:44:07 CET 2009
I apologize to Tanya, there was an error in A061653. There was a 1 missing from
the start of the sequence.
I've made a few other changes - here is the new entry:
%I A061653
%S A061653 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,3,1,1,1,1,1,8,1,9,1,1,1,
%T A061653 1,1,37,1,2,1,121,1,211,1,1,3,695,1,43
%N A061653 Relative class number h- of cyclotomic field Q(zeta_n).
%C A061653 Note that if n == 2 (mod 4), Q(zeta_n) is the same field as Q(zeta_{n/2}).
%e A061653 Q(zeta_23) = 3 is the first time that h- is bigger than 1.
%D A061653 L. C. Washington, Introduction to Cyclotomic Fields, Springer, p. 353.
%Y A061653 Cf. A035115, A055513, A061494, A005848.
%Y A061653 Sequence in context: A046556 A046535 A135939 this_sequence A069226 A016565 A051714
%Y A061653 Adjacent sequences: A061650 A061651 A061652 this_sequence A061654 A061655 A061656
%K A061653 nonn,easy,nice,more
%O A061653 1,23
%A A061653 njas, Jun 16 2001
%E A061653 Washington gives an extensive table on pp. 353-360.
%E A061653 Missing term a(1) = 1 inserted by njas, Feb 05 2009 at the suggestion of Tanya Khova\
nova
Neil
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