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A184753 a(n) = A184752(n)/A130650(n) unless A130650(n) = 0 in which case a(n) = 0. 3
0, 0, 4, 1, 13, 2, 1, 10, 1, 5, 16, 1, 15, 16, 22, 5, 37, 2, 4, 2, 1, 24, 11, 10, 2, 28, 23, 11, 41, 20, 2, 3, 73, 13, 76, 12, 1, 20, 13, 85, 34, 1, 21, 2, 46, 62, 5, 3, 2, 2, 2, 1, 2, 78, 39, 80, 81, 122, 3, 63, 51, 32, 88, 1, 1, 1, 69, 70 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

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.

LINKS

Rémi Eismann, Table of n, a(n) for n = 1..10000

EXAMPLE

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.

CROSSREFS

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

KEYWORD

nonn

AUTHOR

Rémi Eismann, Jan 21 2011

STATUS

approved

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Last modified May 26 09:12 EDT 2017. Contains 287093 sequences.