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1,3
a(n) is the "level" of 3-almost primes.
The decomposition of 3-almost primes into weight * level + gap is A014612(n) = A130650(n) * a(n) + A114403(n) if a(n) > 0.
a(n) = A014612(n) - A114403(n) if A014612(n) - A114403(n) > A114403(n), 0 otherwise.
Rémi Eismann, Table of n, a(n) for n = 1..10000
For n = 1 we have A130650(1) = 0, hence a(1) = 0.
For n = 3 we have A184752(3)/A130650(3)= 16 / 4 = 4; hence a(3) = 4.
For n = 21 we have A184752(21)/A130650(21)= 97 / 97 = 28; hence a(21) = 1.
Cf. A014612, A114403, A130650, A184752, A117078, A117563, A001223, A118534.
Sequence in context: A135704 A002564 A019428 * A055252 A193956 A193843
Adjacent sequences: A184750 A184751 A184752 * A184754 A184755 A184756
nonn
Rémi Eismann, Jan 21 2011
approved