A326459 Sum of the fifth largest parts of the partitions of n into 8 primes.

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 4, 4, 7, 9, 10, 12, 15, 17, 20, 24, 24, 30, 39, 43, 47, 60, 58, 75, 81, 94, 97, 124, 116, 152, 146, 180, 172, 229, 207, 278, 246, 320, 298, 400, 332, 464, 395, 539, 463, 643, 521, 749, 612, 855, 720

Offset

0,17

Links

Table of n, a(n) for n=0..63.

Index entries for sequences related to partitions

Formula

a(n) = Sum_{p=1..floor(n/8)} Sum_{o=p..floor((n-p)/7)} Sum_{m=o..floor((n-o-p)/6)} Sum_{l=m..floor((n-m-o-p)/5)} Sum_{k=l..floor((n-l-m-o-p)/4)} Sum_{j=k..floor((n-k-l-m-o-p)/3)} Sum_{i=j..floor((n-j-k-l-m-o-p)/2)} c(p) * c(o) * c(m) * c(l) * c(k) * c(j) * c(i) * c(n-i-j-k-l-m-o-p) * l, where c = A010051.

a(n) = A326455(n) - A326456(n) - A326457(n) - A326458(n) - A326460(n) - A326461(n) - A326462(n) - A326463(n).

Mathematica

Table[Sum[Sum[Sum[Sum[Sum[Sum[Sum[l * (PrimePi[i] - PrimePi[i - 1]) (PrimePi[j] - PrimePi[j - 1]) (PrimePi[k] - PrimePi[k - 1]) (PrimePi[l] - PrimePi[l - 1]) (PrimePi[m] - PrimePi[m - 1]) (PrimePi[o] - PrimePi[o - 1]) (PrimePi[p] - PrimePi[p - 1]) (PrimePi[n - i - j - k - l - m - o - p] - PrimePi[n - i - j - k - l - m - o - p - 1]), {i, j, Floor[(n - j - k - l - m - o - p)/2]}], {j, k, Floor[(n - k - l - m - o - p)/3]}], {k, l, Floor[(n - l - m - o - p)/4]}], {l, m, Floor[(n - m - o - p)/5]}], {m, o, Floor[(n - o - p)/6]}], {o, p, Floor[(n - p)/7]}], {p, Floor[n/8]}], {n, 0, 50}]

Crossrefs

Cf. A010051, A259198, A326455, A326456, A326457, A326458, A326460, A326461, A326462, A326463.

Sequence in context: A301588 A308921 A308977 * A326545 A326684 A366598

Adjacent sequences: A326456 A326457 A326458 * A326460 A326461 A326462

Keyword

nonn

Author

Wesley Ivan Hurt, Jul 06 2019

Status

approved