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A025546
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(1/4 - 1/6 + ... + d/c(n))*LCM{4, 6, ..., c(n)}, where d = (-1)^(n-1), c(n) = n-th composite number.
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0
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1, 1, 5, 7, 71, 41, 467, 299, 913, 633, 885, 645, 9615, 7305, 47613, 480369, 1841507, 1455407, 1815767, 2955859, 3611059, 50577203, 61079123, 50868923, 1150293137, 971221937, 1145816357, 979535957, 1138258157, 983063117, 26102340091
(list; graph; refs; listen; history; internal format)
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