23642

Appears in sequences

• Number of solutions of +- 1 +- 2 +- ... +- (n-1) +- n = 0 in which the partial sums +- 1 +- ... +- k (1<=k<=n) are all distinct.at n=31A015818
• Number of primes less than 10000n.at n=26A038813
• Numbers n such that (2^p + 1)/3 is prime, where p is the n-th prime.at n=37A123176
• Numbers n such that 4*7^n + 1 is prime.at n=18A204323
• Number of nX7 0..1 arrays with every element unequal to 0, 1, 3, 4 or 7 king-move adjacent elements, with upper left element zero.at n=7A304854
• Total number of ways of partitioning n and any natural number less than or equal to n into the same number of parts, treating partitions of n and itself in a different order as distinct.at n=16A380125