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A286293 A compressed version of A286290. 5

%I #14 May 26 2017 09:37:54

%S 1,2,4,11,17,12,14,16,29,35,24,26,28,30,32,53,59,40,42,44,46,48,50,52,

%T 54,56,58,60,62,98,104,70,72,74,76,78,80,82,84,86,88,90,92,94,96,98,

%U 100,102,104,161,167,112,114,116,118,120,122,124,126,128,130,132,134,136

%N A compressed version of A286290.

%H Ray Chandler, <a href="/A286293/b286293.txt">Table of n, a(n) for n = 1..971</a>

%e Start with A064736, bisect to get A286290, take second difference, and we get:

%e 1, 2, 7, 6, -5, 2, 2, 13, 6, -11, 2, 2, 2, 2, 21, 6, -19, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 36, 6, -34, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 57, 6, -55, 2, 2, ...

%e which appears to consist of runs of 2's separated by a triple of numbers.

%e Look at the runs in that sequence:

%e 1, 1, 1, 1, 1, 2, 1, 1, 1, 4, 1, 1, 1, 11, 1, 1, 1, 17, 1, 1, 1, 12, 1, 1, 1, 14, 1, 1, 1, 16, 1, 1, 1, 29, 1, 1, 1, 35, 1, 1, 1, 24, 1, 1, 1, 26, 1, 1, ...

%e and take the 4i+2 subsequence, which gives the present sequence.

%Y Cf. A064736, A286290, A286291, A286292.

%K nonn

%O 1,2

%A _N. J. A. Sloane_, May 23 2017

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Last modified March 28 17:25 EDT 2024. Contains 371254 sequences. (Running on oeis4.)