18640

Appears in sequences

• Number of Twopins positions.at n=19A005684
• Number of 5-colorings of cyclic group of order n.at n=9A007688
• a(n) = floor( Sum_{1 <= i < j <= n} ((sqrt(j)-sqrt(i))^3) ).at n=45A025197
• a(n) = dot_product(1,2,...,n)*(6,7,...,n,1,2,3,4,5).at n=34A026046
• Number of cubes of primes <= 2^n.at n=53A060969
• a(n) = n*(7*n^2-4)/3.at n=20A063521
• 10000n+1, 10000n+3, 10000n+7, 10000n+9 are all primes.at n=9A064963
• Number of elements in the coprime subsets of the integers 1 to n.at n=22A087080
• G.f. = theta_4(0,x^4)/theta_4(0,x).at n=27A103258
• 100-gonal numbers: a(n) = 98*n*(n-1)/2 + n.at n=20A261276
• a(n) = number of triangles that can be formed from the points of a 3 X n grid.at n=16A262402
• Numbers n such that n^1024 + (n+1)^1024 is prime.at n=31A274234
• Number of distinct integer partitions whose parts can be combined together using additions and multiplications to obtain n, with the exception that 1's can only be added and not multiplied with other parts.at n=28A319913