In example section, "a(10)=8 because the 10th prime=29 is bounded by primes (23,31) separated by a gap 8." is just misleading even if this part: "the 10th prime=29 is bounded by primes (23,31) separated by a gap 8." is correct ;) Correct version may be a(10) = 8 because the 10th prime = 29 is followed by primes (31, 37) and 37 - 29 = 8. Zak