A353363 - OEIS

%I #10 Apr 18 2022 17:49:53

%S 1,2,6,25,38,155,235,294,322,365,390,465,528,638,646,744,765,768,867,

%T 884,924,946,1152,1172,1290,1421,1600,1653,1675,1677,1729,1785,1980,

%U 1989,2002,2028

%N Numbers k such that A046523(A332223(A332223(k))) is equal to A046523(A332223(k)).

%C Numbers k such that A332223(k) is in A353308.

%C If there existed any 3-perfect number (A005820) of the form x = 4u+2 and not divisible by 3, then x would be also included in A353365 and A005940(1+x) would be included in this sequence. See comments in A353365.

%H <a href="/index/Pri#prime_indices">Index entries for sequences computed from indices in prime factorization</a>

%H <a href="/index/Si#SIGMAN">Index entries for sequences related to sigma(n)</a>

%Y Cf. A000203, A005940, A046523, A066961, A156552, A332223, A353365.

%Y Cf. also A353308.

%K nonn

%O 1,2

%A _Antti Karttunen_, Apr 17 2022