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1, 4, 8, 16, 32, 64, 96, 120, 240, 192, 288, 384, 384, 528, 1056, 1344, 896, 960, 960, 1152, 1728, 1920, 3200, 2560, 2560, 2560, 3328, 3744, 3456, 4032, 3456, 6144, 5632, 6336, 5760, 5760, 7776, 8856, 13776, 14784, 8448, 8640, 9216, 10752, 10080, 8640
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listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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Except for the first term, a(n) is divisible by 4.
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LINKS
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MAPLE
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MATHEMATICA
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Table[EulerPhi[(Prime[n + 1] - 1)*(Prime[n] - 1)], {n, 1, 50}] (* Amiram Eldar, Apr 09 2021 *)
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PROG
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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EXTENSIONS
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a(2) inserted and terms beyond a(10) added by R. J. Mathar, Jan 30 2010
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STATUS
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approved
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