92631domain: NAppears in sequencesa(n) = floor( n*(n-1)*(n-2)*(n-3)/29 ).at n=42A011939Strong pseudoprimes to base 83.at n=26A020309a(n) = n*(n+1)*(n^2-2*n+2)/2.at n=21A101375Coefficient of x in the reduction by x^2->x+1 of the polynomial p(n,x) defined below in Comments.at n=19A192756