OFFSET
1,1
COMMENTS
Related to A127931.
Up to 10^9, there are 55 terms (21 odd and 34 even numbers). All except two, 50888 and 7826888, are congruent to 1 mod 3 and none are congruent to 0 mod 3. Is the sequence infinite?
Terms so far are == {1, 4, 7, 8, 10} (mod 12) or {1, 4, 7, 8, 13, 16, 19, 22, 28} (mod 30) and none are == +-3 (mod 8) nor == 5 (mod 10). - Robert G. Wilson v, Feb 12 2007
LINKS
Zak Seidov and Robert G. Wilson v, Table of n, a(n) for n = 1..68
MATHEMATICA
lst = {}; n = 3; While[n < 10000000000, If[PowerMod[2, n(n - 1), n] == 8, AppendTo[lst, n]; Print@n]; n++ ]; lst (* Robert G. Wilson v, Feb 11 2007 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, Feb 10 2007
STATUS
approved