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A072160
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Numerator of Sum_{k=1..n} phi(k)/k^4.
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1
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1, 17, 1409, 11353, 7137097, 7147097, 17199059897, 137714029801, 3721352084627, 3722696337299, 54537603391194659, 54547094712264659, 1558510008178113485699, 1558729492839246365699, 1558951562903235322883, 12472984853932601449939
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