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a(n) is the last term in the n-th block of A280864.
12

%I #12 Jun 12 2026 17:18:51

%S 1,4,8,9,16,13,45,32,27,48,49,54,75,64,99,121,135,81,108,125,128,325,

%T 207,175,169,225,162,147,192,200,216,288,256,139,243,375,459,324,605,

%U 441,425,513,405,637,529,343,567,475,289,621,448,657,539,575,361,507,711,486,540,747,512,845,837,656,855,576,725,675,648,672,999

%N a(n) is the last term in the n-th block of A280864.

%H N. J. A. Sloane, <a href="/A396300/b396300.txt">Table of n, a(n) for n = 1..11337</a>

%F a(n) = A280864(A280774(n)).

%Y Cf. A280864, A280774.

%K nonn

%O 1,2

%A _N. J. A. Sloane_, Jun 09 2026