Dear SeqFans; a(0) = 2, a(n) = smallest prime p such that none of p - 1, p - 2, ..p - n are cubefree: 2, 17, 137, 13313, 912251, ...(for OEIS?); a(0) = 2, a(n) = smallest prime p such that none of p + 1, p + 2, ..p + n are cubefree: 2, 7, 79, 4373, 885623, ...(for OEIS?). Best. JSG