20585

Appears in sequences

• Define the sequence T(a_0,a_1) by a_{n+2} is the greatest integer such that a_{n+2}/a_{n+1}<a_{n+1}/a_n for n >= 0. This is T(8,57).at n=4A022038
• "CFK" (necklace, size, unlabeled) transform of 1,2,3,4...at n=17A032141
• Digital sum of the 2^n-th partition number.at n=24A129491
• a(1) = 1; a(n) = 1 + a(n-1) + Sum_{k=2..n} a(floor(n/k)).at n=40A351621
• a(n) is the least number k such that the k-th difference between consecutive practical numbers, A179651(k), equals 2*n, or -1 if no such k exists.at n=21A364706
• The number of lit cells in weakly increasing partitions of n when light shines from the northwest. Here partitions are represented from left to right by columns of cells.at n=23A366069