A353465 - OEIS

%I #5 Apr 24 2022 09:17:08

%S 0,4,6,10,12,16,18,22,24,28,32,38,44,50,56,60,64,66,70,72,76,78,82,84,

%T 88,92,98,104,110,116,120,124,126,130,132,136,138,142,144,148,152,158,

%U 164,170,176,180,184,186,190,192,196,198,202,204,208,212,218,224,230,236,240,244,246,250,252,256,258,262,264

%N Numbers k for which A276086(k) is of the form 4k+1.

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

%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 A353488(n) = (1==(A276086(n)%4));

%o isA353465(n) = A353488(n);

%Y Cf. A276086, A353486, A353488 (characteristic function).

%Y Sequences A005408, A353466 and this sequence partition the natural numbers to three disjoint sets.

%K nonn,base

%O 1,2

%A _Antti Karttunen_, Apr 24 2022