30580

Appears in sequences

• Denominators of continued fraction convergents to sqrt(998).at n=9A042933
• Number of ways to label the vertices of the octahedron (or faces of the cube) with nonnegative integers summing to n, where labelings that differ only by rotation or reflection are considered the same.at n=40A097513
• a(n) = 4 * floor(28*2^n/15).at n=12A102650
• Lower triangular array called S2hat(-5) related to partition number array A144341.at n=23A144342
• Number of nondecreasing -n..n vectors of length 3 whose dot product with some nondecreasing -n..n vector equals 3.at n=28A226411
• Numbers m such that there exists a j for which m = Sum_{k=1..j} (m mod k), where k runs through the largest j primes less than m.at n=43A274422
• a(1)=1; for n>1, a(n) = least integer greater than a(n-1) such that the sums of the divisors of the pairwise sums of a(1),...,a(n) are all distinct.at n=46A293542
• Larger of amicable pair m < n defined by t(n) = m and t(m) = n where t(n) = psi(n) - n and psi(n) = A001615(n) is the Dedekind psi function.at n=16A323330
• a(1) = 1; a(n) = 1 + a(n-1) + Sum_{k=2..n} a(floor(n/k)).at n=44A351621
• Sorted positions of first appearances in A368109 (number of ways to choose a binary index of each binary index).at n=43A368112
• a(n) = Sum_{k=0..n} binomial(k+3,3) * binomial(k,n-k)^2.at n=8A377148