280369

Appears in sequences

• Strong pseudoprimes to base 88.at n=34A020314
• Number of (n+6)X8 0..1 matrices with each 7X7 subblock idempotent.at n=18A224582
• a(n) = Sum_{1 <= x_1, x_2 <= n} gcd(x_1, x_2, n)^4.at n=22A372926