211646

Appears in sequences

• Numbers n such that sopf(n) = sopf(n-1) - sopf(n-2), where sopf(x) = sum of the distinct prime factors of x.at n=19A076527
• a(n) = 400*n^2 + 2*n.at n=22A158312
• Triangle read by rows: distribution of adjacent transpositions in involutions.at n=50A217876