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%I #12 Oct 23 2016 16:04:01
%S 0,-7,-84,-855,-7986,-64455,-287568,5666105,276309378,8888888889,
%T 274200559500,8804989337145,301763995481142,11100895714446905,
%U 437782779269748264,18445632962598440505,827229150775225653066
%N a(n) = n^n - A002275(n).
%C 20^20-11111111111111111111=104857588888888888888888889 is the only known prime term of this sequence. Next such prime has more than 40000 digits (n>10000)!
%H Robert Israel, <a href="/A177009/b177009.txt">Table of n, a(n) for n = 1..386</a>
%F a(n) = n^n - (10^n-1)/9. - _Robert Israel_, Oct 23 2016
%e a(2) = 2^2-11 = -7, a(8) = 8^8-11111111 = 5666105.
%p seq(n^n - (10^n-1)/9. n=1..20); # _Robert Israel_, Oct 23 2016
%t Table[n^n - (10^n - 1)/9, {n, 17}]
%Y Cf. A000312, A002275, A177010.
%K easy,sign,base
%O 1,2
%A Ali Heydarian (mymontain(AT)yahoo.com), May 13 2010
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