A308891 Positions of 0's on the spiral defined in A308890.
1, 2, 3, 4, 21, 26, 31, 36, 37, 38, 41, 42, 43, 48, 49, 50, 55, 56, 57, 64, 66, 71, 80, 89, 95, 96, 111, 113, 115, 116, 122, 124, 126, 127, 133, 135, 138, 139, 142, 144, 145, 146, 148, 150, 151, 153, 155, 156, 157, 163, 166, 168, 169, 170, 176, 179, 181, 182, 183, 196, 198, 209, 215, 224
Offset: 1
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