222272

Appears in sequences

• Determinant of Hankel matrix of the first 2n-1 prime numbers.at n=8A024356
• a(n) contains n digits (either '2' or '7') and is divisible by 2^n.at n=5A053318
• E.g.f.: Sum_{n>=0} arctanh(n*x)^n/n!.at n=6A221079
• Array read by antidiagonals: T(n,k) is the determinant of the Hankel matrix of the 2*n-1 consecutive primes starting at the k-th prime, n >= 0, k >= 1.at n=44A350200