68912

Appears in sequences

• Group the natural numbers so that the n-th group contains n numbers whose concatenation is divisible by n: (1), (2, 4), (3, 5, 7), (6, 8, 9, 12), (10, 11, 13, 14, 15), (16, 17, 18, 19, 20, 24), ... Sequence gives numbers formed by the concatenation.at n=3A075621
• Number of arrangements of 5 nonzero numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero.at n=11A188251
• G.f.: Sum_{n>=0} x^(n*(n+1)/2) * P(x)^n, where P(x) is the partition function (A000041).at n=21A356507