335440

Appears in sequences

• Numbers n such that phi(n) + phi(n+1) = sigma(n)/2.at n=31A076647
• Triangle of coefficients of q in e.g.f. that satisfies: A(x,q) = exp( q*x*A(q*x,q) ), read by rows of [n*(n-1)/2 + 1] terms in row n for n>=0.at n=74A126265
• Number of (n+4)X(n+4) 0..2 matrices with each 5X5 subblock idempotent.at n=12A224617