138200domain: NAppears in sequencesIf a(n-1)=abcde..., where a,b,c,d,e... are the digits, then a(n)=abcde...+a*bcde...+ab*cde...+abc*de...+abcd*e...+....at n=12A108721Floor of the area of consecutive Prime-Indexed Prime triangles.at n=22A119659a(n) = Sum_{k=0..n} floor(sqrt(Bell(k)))*floor(sqrt(Bell(n-k))).at n=15A192573