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%I #5 Jan 05 2025 10:00:02
%S 0,2,1,4,3,8,7,6,5,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,
%T 26,27,28,29,30,31,32,40,36,35,34,33,37,38,39,50,41,42,43,44,45,46,47,
%U 48,49,60,51,52,53,54,55,56,57,58,59,72,63,62,61,65,64,68
%N Nonpositive values in A377091, negated, in order of appearance and with offset 0.
%C Conjecture: this sequence is a permutation of the nonnegative integers.
%H Rémy Sigrist, <a href="/A379874/b379874.txt">Table of n, a(n) for n = 0..10000</a>
%H Rémy Sigrist, <a href="/A379874/a379874.gp.txt">PARI program</a>
%e A377091 begins:
%e 0, 1, 2, -2, -1, 3, 4, 5, -4, -3, 6, 7, 8, -8, -7, -6, -5, -9, -10, -11, -12, 13
%e So the present sequence begins:
%e 0, 2, 1, 4, 3, 8, 7, 6, 5, 9, 10, 11, 12
%o (PARI) \\ See Links section.
%Y Cf. A377091, A379873.
%K nonn,new
%O 0,2
%A _Rémy Sigrist_, Jan 05 2025