A171925 Positions of 2's in A171922.
2, 3, 5, 9, 13, 24, 48, 72, 119, 220, 348, 407, 587, 797, 1125, 1555, 1847, 2581, 3560, 3571, 3690, 4982, 6739, 7134, 9429, 11659
Offset: 1
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