A393082 Fourth column of A392806.

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, 8, 16, 24, 32, 40, 48, 0, 10, 20, 30, 40, 50, 60, 0, 12, 24, 36, 48, 60, 72, 0, 16, 32, 48, 64, 80, 96, 1, 19, 37, 55, 73, 91, 109, 2, 22, 42, 62, 82, 102, 122, 3, 25

Offset

0,9

Comments

See also A392806 for a Python program.

Links

A.H.M. Smeets, Table of n, a(n) for n = 0..10000

Formula

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

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

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).

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

Crossrefs

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

Sequence in context: A185449 A096922 A241071 * A384275 A353026 A356431

Adjacent sequences: A393079 A393080 A393081 * A393083 A393084 A393085

Keyword

nonn

Author

A.H.M. Smeets, Feb 01 2026

Status

approved