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Numbers k such that A276086(k) mod k is an even number, where A276086 is the primorial base exp-function.
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%I #7 Nov 25 2022 11:10:39

%S 1,3,11,15,17,25,27,31,43,51,57,59,63,71,75,77,83,85,87,93,95,103,105,

%T 107,109,115,119,129,133,137,139,145,147,151,157,167,169,171,173,175,

%U 177,185,189,191,199,201,207,211,213,215,217,221,223,229,233,235,237,241,257,259,263,269,281,289,299,303,305,307

%N Numbers k such that A276086(k) mod k is an even number, where A276086 is the primorial base exp-function.

%C All terms are odd.

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

%F {k | A328386(k) == 0 (mod 2)}.

%o (PARI)

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

%o A358224(n) = ((A276086(n)%n)%2);

%o isA358226(n) = !A358224(n);

%Y Cf. A276086, A328386, A328387 (subsequence), A358225 (complement).

%Y Positions of zeros in A358224.

%Y Cf. also A358229.

%K nonn

%O 1,2

%A _Antti Karttunen_, Nov 25 2022