A126287 a(1) = 1, a(2) = 1, a(n) = n * LeastPrimeFactor(n-1) / LeastPrimeFactor(n)

1, 1, 2, 6, 2, 15, 2, 28, 6, 15, 2, 66, 2, 91, 10, 24, 2, 153, 2, 190, 14, 33, 2, 276, 10, 65, 18, 42, 2, 435, 2, 496, 22, 51, 14, 90, 2, 703, 26, 60, 2, 861, 2, 946, 30, 69, 2, 1128, 14, 175, 34, 78, 2, 1431, 22, 140, 38, 87, 2, 1770, 2, 1891, 42, 96, 26, 165, 2, 2278, 46, 105