26470

Appears in sequences

• a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (Fibonacci numbers), t = (composite numbers).at n=27A024461
• a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (Fibonacci numbers), t = (composite numbers).at n=26A025081
• Numbers k such that k-th and (k+1)-st term of A038593 differ by 3.at n=23A038634
• Sum of squares of numbers that can be written as t*n + u*(n+1) for nonnegative integers t,u in exactly two ways.at n=3A076461
• Bond series for second parallel moment of 4.8 (bathroom tile) lattice.at n=17A120555
• Number of binary strings of length n with no substrings equal to 0000 or 0110.at n=17A164390
• Number of (w,x,y,z) with all terms in {1,...,n} and 2w=x+y+z.at n=40A212068
• Number of set partitions of [n] into exactly ten blocks such that all odd elements are in blocks with an odd index and all even elements are in blocks with an even index.at n=5A274874
• Sum of the fourth largest parts in the partitions of n into 8 parts.at n=44A308995