OFFSET
0,3
REFERENCES
J. Brillhart et al., Factorizations of b^n +- 1. Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 2nd edition, 1985; and later supplements.
LINKS
T. D. Noe, Rows n=0..500 of triangle, flattened (derived from Brillhart et al.)
Joerg Arndt, Rows n=1..1200 of triangle when repetitions are included (derived from Brillhart et al.)
J. Brillhart et al., Factorizations of b^n +- 1, Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 3rd edition, 2002.
Jeroen Demeyer, Machine-readable Cunningham Tables [Broken link]
S. S. Wagstaff, Jr., The Cunningham Project
EXAMPLE
From Wolfdieter Lang, Sep 23 2017: (Start)
The irregular triangle T(n,k) begins for n >= 2:
n\k 1 2 3 4 5
2: 3
3: 7
4: 3 5
5: 31
6: 3 7
7: 127
8: 3 5 17
9: 7 73
10: 3 11 31
11: 23 89
12: 3 5 7 13
13: 8191
14: 3 43 127
15: 7 31 151
16: 3 5 17 257
17: 131071
18: 3 7 19 73
19: 524287
20: 3 5 11 31 41
... (End)
MATHEMATICA
Array[FactorInteger[2^# - 1][[All, 1]] &, 25, 0] (* Paolo Xausa, Apr 18 2024 *)
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
STATUS
approved
