|
Search: id:A002147
|
|
|
| A002147 |
|
Largest prime == 7 mod 8 with class number 2n+1.
(Formerly M4402 N1857)
|
|
+0
3
|
|
| 7, 31, 127, 487, 1423, 1303, 2143, 2647, 4447, 5527, 5647, 6703, 5503, 11383, 8863, 13687, 13183, 12007, 22807, 18127, 21487, 22303, 29863, 25303, 27127
(list; graph; listen)
|
|
|
OFFSET
|
0,1
|
|
|
COMMENT
|
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.
|
|
REFERENCES
|
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.
|
|
LINKS
|
David Broadhurst, Table of n, a(n) for n=0..2246 (conjectural; see comment)
|
|
CROSSREFS
|
Cf. A002146.
Sequence in context: A002588 A036280 A056909 this_sequence A083420 A036282 A033474
Adjacent sequences: A002144 A002145 A002146 this_sequence A002148 A002149 A002150
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
njas
|
|
|
Search completed in 0.002 seconds
|
