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A075794
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a(n) = the least positive integer k such that phi(k) > phi(1) + ... + phi(n).
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0
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3, 5, 7, 11, 13, 17, 23, 29, 31, 37, 47, 53, 61, 67, 79, 83, 101, 107, 127, 131, 149, 157, 179, 191, 211, 223, 233, 251, 277, 281, 311, 331, 347, 367, 389, 401, 439, 457, 479, 499, 541, 547, 587, 607, 631, 653, 701, 719, 757, 787, 809, 839, 887, 907, 947, 967
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OFFSET
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1,1
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LINKS
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EXAMPLE
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phi(1) + ... + phi(4) = 6 and k = 11 is the least positive integer such that sigma(k) > 6. Hence a(4) = 11.
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MATHEMATICA
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s = 0; a = {}; For[i = 1, i <= 100, i++, s = s + EulerPhi[i]; k = 1; While[EulerPhi[k] <= s, k = k + 1]; a = Append[a, k]]; a
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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