RGWv: "a(1) to a(15): {5, 3, 13, 5, 3, 29, 3, 13, 13, 3, 5, 127, 31, 7, 17}." Replying to my posting of the sequence to a(11), Chai Wah Wu previously noted: "a(12) = 31, a(13) = 7, a(14) = 17." Which one is correct?