[seqfan] Around Recaman, A231692 and A231693.
Brigitte et Paul Curtz
bpcrtz at free.fr
Wed Nov 20 18:39:03 CET 2013
Dear all,
A005142 and differences:
0, 1, 3, 6, 2, 7, 13, 20, 12, 21, 11,..
1, 2, 3 , -4, 5, 6, -7, -8 , 9, -10,... .
Is the rank of the negative terms specified somewhere?
A231692/A231693 and differences:
0, 1, 1/2, 1/6, 5/12, 13/60, 1/20, 27/140, 19/280,
451/2520,...
1, -1/2, -1/3, 1/4, -1/5, -1/6, 1/7, -1/8, 1/9,
-1/10 ,... .
The rank of the negative terms must be written.
Inverse Akiyama-Tanigawa transform applied to (-1)^n*A051716/A051717
(in A190339):
1, 1/2, 1/12, -5/18, -431/720,...
1/2, 5/6, 13/12, 77/60, 29/20, 223/140,... =g(n)
=A064169/A231693(n+2)? =(if unreduced: A027612/(n*A027611 with offset 1 ?)
-1/3, -1/2, -3/5, -2/3, -5/7, -3/4,...
1/6, 1/5, 1/5, 4/21, 5/28, 1/6,...
-1/30, 0, 1/35, 1/21, 5/84, 1/15,... .
Note 1+2=3, 5+6=11, 13+12=25, 77+60=137, 29+30=49,. ...=A001008(n+1).
A231692(n+2)/A231693(n+2) + g(n)=
2/2=1, (1+5=6)/6=1, (5+13=18)/12=3/2, (13+77=90)/60=3/2,
(1+29=30)/20=3/2, (27+223=250)/140=25/14,... .
Best regards
Paul
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