110394

Appears in sequences

• Index of Mersenne number A000225 that is also Mersenne prime A000668, minus n-th prime: a(n) = A000043(n) - A000040(n).at n=28A153801
• Triangle read by rows: T(n,k) is the number of k-element equivalence classes of closed meanders with 2n points.at n=9A339460