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A048618
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If n=2x, then Mod(C(2x, x), 2x) = 0, i.e. even n divides A001405(n), the central binomial coefficients.
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0
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2, 4, 12, 30, 40, 56, 84, 90, 132, 154, 176, 182, 208, 220, 252, 280, 306, 312, 340, 374, 380, 408, 418, 420, 440, 456, 462, 476, 480, 532, 552, 598, 616, 624, 630, 644, 650, 660, 690, 736, 756, 828, 840, 858, 870, 880, 884, 900, 918, 920, 928, 936, 952, 966
(list; graph; refs; listen; history; internal format)
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