20822

Appears in sequences

• Even numbers k such that if a person is born in year k and lives not more than 100 years, then he never celebrates his prime birthday on a prime year.at n=20A124658
• Numbers n such that sigma(n) and sigma(sigma(n)) are both perfect squares.at n=24A134263
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 1), (1, -1, 1), (1, 1, -1), (1, 1, 0), (1, 1, 1)}.at n=7A151016
• Number of ways to choose disjoint strict rooted partitions of each part in a strict rooted partition of n.at n=33A301756