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A358765 a(n) = A003415(n)*A276086(n) mod 60, where A003415 is the arithmetic derivative and A276086 is the primorial base exp-function. 6

%I #10 Dec 08 2022 16:32:25

%S 0,0,3,6,36,18,25,10,0,0,15,30,40,50,15,0,0,30,45,10,0,0,45,30,20,20,

%T 45,30,0,30,37,14,0,48,57,12,0,10,45,0,0,30,35,50,0,30,15,30,20,20,45,

%U 0,0,30,15,20,0,0,45,30,8,38,51,54,12,36,5,10,0,0,15,30,0,50,45,30,0,0,55,10,0,0,15

%N a(n) = A003415(n)*A276086(n) mod 60, where A003415 is the arithmetic derivative and A276086 is the primorial base exp-function.

%H Antti Karttunen, <a href="/A358765/b358765.txt">Table of n, a(n) for n = 0..60060</a>

%H <a href="/index/Pri#primorialbase">Index entries for sequences related to primorial base</a>

%F a(n) = A358669(n) mod 60.

%o (PARI)

%o A003415(n) = if(n<=1, 0, my(f=factor(n)); n*sum(i=1, #f~, f[i, 2]/f[i, 1]));

%o A276086(n) = { my(m=1, p=2); while(n, m *= (p^(n%p)); n = n\p; p = nextprime(1+p)); (m); };

%o A358765(n) = ((A003415(n)*A276086(n))%60);

%Y Cf. A003415, A276086, A358669, A358850.

%Y Cf. A016825 (positions of odd terms), A042965 (of even terms), A235992 (of multiples of 4), A067019 (of terms of the form 4k+2).

%K nonn

%O 0,3

%A _Antti Karttunen_, Dec 06 2022

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Last modified July 9 02:21 EDT 2024. Contains 374171 sequences. (Running on oeis4.)