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%I #22 May 08 2021 08:28:47
%S 2329,4369,10537,35209,281929,1114129,8978569,16843009,143163649,
%T 286331153,1086374209,4295098369,9198250129,18325194049,36507844609,
%U 73016672273,139055899009,277033877569,586397253889,1103840280833,4673067091009,9382516064513,17868687216769
%N Composite terms of A007755.
%C 10537 is a term because it is composite (= 41*257) and the totient (A000010) iterating "trajectory" starting from 10537 and ending in 1 is longer (length 15) than any similar trajectory starting from a (prime or nonprime) N < 10537.
%Y Cf. A000010, A003434, A049108, A007755, A098196.
%K nonn
%O 1,1
%A _Jeppe Stig Nielsen_, Oct 05 2019