Bernoulli numbers and arithmetic progressions
Richard Guy
rkg at cpsc.ucalgary.ca
Mon Feb 9 19:27:59 CET 2004
Evidently yet another manifestation of
the Law of Small Numbers. R.
On Sun, 8 Feb 2004, Hans Havermann wrote:
> I asked:
>
> > What are the values of p*k-(p-1)/2 where
> > Mod[Numerator[BernoulliB[2k]], p] == 0 for p=37?
> >
> > {574, 1240, 1351, 1906, 2572, 2720, 3238, 3904, 4089, 4570, 5236,
> > 5458, 5902, 6568, 6827, 7234, 7900, 8196, 8566, 9232, 9565, 9898, ...}
> >
> > Every third term in this calculated sequence, it seems, is a number
> > that does not figure in the *actual* 37-appearance sequence.
>
> I was still convinced however, ignoring every third term, that 37
> appears periodically with a difference of 666 between adjacent terms.
> As I calculated and collated the differences between adjacent terms of
> a range of irregular primes, hoping to differentiate the clearly
> periodic ones from the aberrations, I ran into a rude surprise as I
> upped my values of k. Same calculation as above, ignoring every third
> term, the differences between adjacent terms for p=37 are:
>
> {666, 666, 666, 666, 666, 666, 666, 666, 666, 666, 666, 666, 666, 666,
> 666, 666, 666, 666, 666, 666, 666, 666, 666, 666, 666, 666, 666, 666,
> 666, 666, 666, 1332, 666, 666, 666, 1332, 111, 1221, 148, 1184, 185,
> 1147, 222, 1110, 259, 1073, 296, 1036, 333, 999, 370, 962, 407, ...}
>
> I feel a little discombobulated and would appreciate someone confirming
> or denying this progression.
>
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