Seqfans: > %E A034115 How is this different from A034105? A034115 has the starts of runs of consecutive values of A034105. That is, frac{sqrt[a(n)]} >= 0.9, but frac{sqrt[a(n)-1]} < 0.9. Exercise: prove that this formula works. A034115(n) = n^2 + 9n + 25 + floor[(4n) / 5] -- Don Reble djr at nk.ca