[seqfan] A102371 Missing sloppy binary numbers - an OEIS experiment
Georg.Fischer
georg.fischer at t-online.de
Thu Apr 14 21:25:51 CEST 2022
Hi Seqfans,
my initial goal was to compute A102371 as the complement of A102370,
but that is not straigtforward since A102370 is not monotone
ascending. Then I realized that A102371(n) is close to 2^n,
and looked up the differences (accidentally starting at a(3))
with this OEIS search:
1,4,3,2,5,8,7,6
That search yields 2 sequences:
A103530 a(n) = 2^n - A103529(n).
A263449 Permutation of the natural numbers: [4k+1, 4k+4, 4k+3, 4k+2,
(and a third, A194187 Difference of n-th prime ...)
So I wondered what the differences between A103530 and A263449
could be, and with further OEIS searching and some Perl program
I finally checked that for n up to 1000 the few terms
that differ at all are 8 times of Knuth's sequence:
A182105 Number of elements merged by bottom-up merge sort. 1, 1, 2, 1,
1, 2, 4, 1, 1, 2, 1, 1, 2, 4, 8, 1, 1, ...
I suppose that some of you are a lot deeper in that area -
maybe you can tell whether this relation is trivial, or
can be proved, or is as miraculous as the formula in A103530?
Regards - Georg
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