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A070192 Numbers k such that k divides the numerator of B(2k) (the Bernoulli numbers), but gcd(3k, 8^k+1) > 3. 4
301, 737, 1505, 1655, 2107, 3197, 3311, 3913, 5117, 5159, 5219, 5719, 6275, 6923, 7385, 7513, 7525, 8107, 8275, 8729, 9331, 9581, 9835, 10535, 10849, 11137, 11585, 12341, 12529, 12943, 13301, 14003, 14147, 14749, 15953, 15985, 17759, 18361 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Equivalently, k is in A069040 but not in A070191.
LINKS
MATHEMATICA
testb[n_] := Select[First/@FactorInteger[n], Mod[2n, #-1]==0&]=={}; test8[n_] := GCD[3n, PowerMod[8, n, 3n]+1]==3; Select[Range[19000], testb[ # ]&&!test8[ # ]&]
CROSSREFS
Sequence in context: A298506 A282769 A256101 * A298326 A299219 A300033
KEYWORD
nonn,more
AUTHOR
STATUS
approved

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Last modified March 2 19:01 EST 2024. Contains 370498 sequences. (Running on oeis4.)