216213

Appears in sequences

• Group the composite numbers so that the sum of the n-th group is a multiple of the n-th prime: (4), (6), (8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22), (24, 25), (26, 27, 28, 30, 32), (33, 34, ...), ... Sequence gives sum of n-th group.at n=24A074124
• O.g.f. A(x) satisfies: [x^n] exp(n*A(x)) * (1 - n*x/(1-x)) = 0, for n > 0.at n=7A321087