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A075882
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a(n) = phi(Sum_{i=1,...,n} prime(i)).
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0
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1, 4, 4, 16, 12, 40, 28, 60, 40, 84, 64, 196, 96, 280, 160, 252, 160, 332, 280, 420, 352, 672, 396, 636, 416, 756, 624, 912, 576, 1044, 672, 1232, 840, 1416, 1136, 1616, 1152, 2640, 1380, 1764, 1540, 2292, 1696, 2552, 1872, 2816, 1896, 4524, 2208, 4032, 2120
(list; graph; refs; listen; history; internal format)
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