No calc please
3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59
9 15 21 25 27 33 35 39 45 49 51 55 57
61 67 71 73 79 83 89
63 65 69 75 77 81 85 87 91 93
94 seems correct