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A327933 Numbers such that the smallest prime factor of their arithmetic derivative is 3. 4
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Numbers n for which A086134(n) = 3.

Numbers whose arithmetic derivative is an odd multiple of 3.

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..10000

PROG

(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));

CROSSREFS

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

KEYWORD

nonn

AUTHOR

Antti Karttunen, Sep 30 2019

STATUS

approved

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Last modified August 15 12:09 EDT 2022. Contains 356145 sequences. (Running on oeis4.)