388841domain: NAppears in sequencesQuasi-Carmichael numbers to base 5: squarefree composites n such that (n,2*3) = 1 and prime p|n ==> p-5|n-5.at n=30A029558Number of length n+5 0..2 arrays with at most one downstep in every n consecutive neighbor pairs.at n=24A255112