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A324880 Even numbers k such that A324863(k) = A324874(k). 2

%I #10 Jul 20 2021 23:48:44

%S 16,64,90,256,484,490,750,756,810,988,1000,1024,1296,1440,2116,2622,

%T 2662,3630,3710,4004,4116,4624,4896,4900,5880,6426,6724,6760,7290,

%U 7744,7840,7920,8100,8924,9604,10000

%N Even numbers k such that A324863(k) = A324874(k).

%C Of 36 such numbers found in the range 1..10000, the following ten: 90, 490, 750, 810, 2622, 2662, 3630, 3710, 6426, 7290, are such that a positive integer of the form 4m+1 is produced when A156552 is applied to them: 45, 105, 117, 189, 225, 405, 765, 2205, 2565, 262185 (when sorted into ascending order). See also A324647.

%H <a href="/index/Bi#binary">Index entries for sequences related to binary expansion of n</a>

%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>

%o (PARI) for(n=1,10000,if(!(n%2)&&A324863(n)==A324874(n), print1(n,", ")));

%Y Cf. A156552, A323243, A324398, A324647, A324863, A324866, A324874.

%Y Subsequence of A324879.

%K nonn

%O 1,1

%A _Antti Karttunen_, Mar 27 2019

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Last modified March 28 08:02 EDT 2024. Contains 371236 sequences. (Running on oeis4.)