The first, 11, terms, starting at i=0 of the sequence: Largest pos. integer N\ OT representable as a sum of DISTINCT values of the the polynomial in j, (j + 2) (j + 1)/2, with j>=i, are [33, 50, 113, 118, 173, 213, 223, 320, 372, 473, 516] ------------------------------------- This took, 85.072, seconds.