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A327933
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Numbers such that the smallest prime factor of their arithmetic derivative is 3.
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4
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14, 18, 26, 27, 38, 45, 50, 54, 62, 63, 74, 86, 90, 99, 110, 117, 122, 125, 126, 134, 146, 153, 158, 162, 170, 171, 194, 198, 206, 207, 218, 230, 234, 242, 243, 254, 261, 270, 275, 278, 279, 290, 302, 306, 314, 326, 333, 342, 343, 362, 369, 374, 378, 386, 387, 398, 405, 410, 414, 422, 423, 425, 446, 450, 458, 470
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OFFSET
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1,1
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COMMENTS
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Numbers n for which A086134(n) = 3.
Numbers whose arithmetic derivative is an odd multiple of 3.
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LINKS
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Antti Karttunen, Table of n, a(n) for n = 1..10000
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PROG
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(PARI)
A003415(n) = {my(fac); if(n<1, 0, fac=factor(n); sum(i=1, matsize(fac)[1], n*fac[i, 2]/fac[i, 1]))}; \\ From A003415
A086134(n) = { my(d=A003415(n)); if(d<=1, 0, factor(d)[1, 1]); };
isA327933(n) = (3==A086134(n));
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CROSSREFS
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Cf. A003415, A086134, A235992, A327935.
Intersection of A235991 and A327863.
Sequence in context: A000053 A169871 A304144 * A079349 A355041 A212047
Adjacent sequences: A327930 A327931 A327932 * A327934 A327935 A327936
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KEYWORD
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nonn
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AUTHOR
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Antti Karttunen, Sep 30 2019
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STATUS
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approved
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