A393082 - OEIS

%I #24 Feb 12 2026 14:18:03

%S 0,0,0,0,0,0,0,0,2,4,6,8,10,12,0,4,8,12,16,20,24,0,6,12,18,24,30,36,0,

%T 8,16,24,32,40,48,0,10,20,30,40,50,60,0,12,24,36,48,60,72,0,16,32,48,

%U 64,80,96,1,19,37,55,73,91,109,2,22,42,62,82,102,122,3,25

%N Fourth column of A392806.

%C See also A392806 for a Python program.

%H A.H.M. Smeets, <a href="/A393082/b393082.txt">Table of n, a(n) for n = 0..10000</a>

%F a(7^k) = 0, k >= 0.

%F a(7*n + k) = a(7*n) + 2*k*Sum_{i = 1..n} A373217(i), 0 < k < 7.

%F a(7^(e+1)*n + 7^e*k) = a(7^(e+1)*n) + max(0,-A392138(e)+2*7^e*k*Sum_{i=1..n} A373217(i), e >= 0, 0 < k < 5, a(0) = 0 (completely determines this sequence).

%F a(n) = A214411(A392805(n)).

%Y Cf. A214411, A373217, A392138, A392805, A392806.

%K nonn

%O 0,9

%A _A.H.M. Smeets_, Feb 01 2026