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1, 2, 3, 6, 12, 14, 15, 30, 35, 38, 42, 54, 56, 70, 78, 87, 95, 105, 114, 126, 135, 140, 147, 168, 174, 182, 190, 209, 210, 215, 216, 222, 248, 258, 264, 270, 285, 294, 297, 315, 357, 418, 420, 430, 455, 456, 540, 546, 551, 570, 594, 609, 616, 627
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OFFSET
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1,2
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COMMENTS
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sigma_3(k) is the sum of the cubes of the divisors of k (A001158).
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LINKS
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MATHEMATICA
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Select[Range[630], Divisible[DivisorSigma[3, #], EulerPhi[#]] &] (* Amiram Eldar, Jun 23 2019 *)
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PROG
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(PARI) isok(k) = (sigma(k, 3) % eulerphi(k)) == 0; \\ Michel Marcus, Jun 23 2019
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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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