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D.12.2.3 disc
Procedure from library atkins.lib (see atkins_lib).
- Usage:
- disc(N,k);
- Return:
- list L of negative discriminants D, sorted in decreasing order
- Assume:
- D<0, D kongruent 0 or 1 modulo 4 and |D|<4N
- Note:
- D=b^2-4*a, where 0<=b<=k and intPart((b^2)/4)+1<=a<=k for each b
Example:
| | LIB "atkins.lib";
disc(2003,50);
==> [1]:
==> -3
==> [2]:
==> -4
==> [3]:
==> -7
==> [4]:
==> -8
==> [5]:
==> -11
==> [6]:
==> -12
==> [7]:
==> -15
==> [8]:
==> -16
==> [9]:
==> -19
==> [10]:
==> -20
==> [11]:
==> -23
==> [12]:
==> -24
==> [13]:
==> -27
==> [14]:
==> -28
==> [15]:
==> -31
==> [16]:
==> -32
==> [17]:
==> -35
==> [18]:
==> -36
==> [19]:
==> -39
==> [20]:
==> -40
==> [21]:
==> -43
==> [22]:
==> -44
==> [23]:
==> -47
==> [24]:
==> -48
==> [25]:
==> -51
==> [26]:
==> -52
==> [27]:
==> -55
==> [28]:
==> -56
==> [29]:
==> -59
==> [30]:
==> -60
==> [31]:
==> -63
==> [32]:
==> -64
==> [33]:
==> -67
==> [34]:
==> -68
==> [35]:
==> -71
==> [36]:
==> -72
==> [37]:
==> -75
==> [38]:
==> -76
==> [39]:
==> -79
==> [40]:
==> -80
==> [41]:
==> -83
==> [42]:
==> -84
==> [43]:
==> -87
==> [44]:
==> -88
==> [45]:
==> -91
==> [46]:
==> -92
==> [47]:
==> -95
==> [48]:
==> -96
==> [49]:
==> -99
==> [50]:
==> -100
==> [51]:
==> -103
==> [52]:
==> -104
==> [53]:
==> -107
==> [54]:
==> -108
==> [55]:
==> -111
==> [56]:
==> -112
==> [57]:
==> -115
==> [58]:
==> -116
==> [59]:
==> -119
==> [60]:
==> -120
==> [61]:
==> -123
==> [62]:
==> -124
==> [63]:
==> -127
==> [64]:
==> -128
==> [65]:
==> -131
==> [66]:
==> -132
==> [67]:
==> -135
==> [68]:
==> -136
==> [69]:
==> -139
==> [70]:
==> -140
==> [71]:
==> -143
==> [72]:
==> -144
==> [73]:
==> -147
==> [74]:
==> -148
==> [75]:
==> -151
==> [76]:
==> -152
==> [77]:
==> -155
==> [78]:
==> -156
==> [79]:
==> -159
==> [80]:
==> -160
==> [81]:
==> -163
==> [82]:
==> -164
==> [83]:
==> -167
==> [84]:
==> -168
==> [85]:
==> -171
==> [86]:
==> -172
==> [87]:
==> -175
==> [88]:
==> -176
==> [89]:
==> -179
==> [90]:
==> -180
==> [91]:
==> -183
==> [92]:
==> -184
==> [93]:
==> -187
==> [94]:
==> -188
==> [95]:
==> -191
==> [96]:
==> -192
==> [97]:
==> -195
==> [98]:
==> -196
==> [99]:
==> -199
==> [100]:
==> -200
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