A024082 - OEIS

%I #18 Sep 08 2022 08:44:48

%S 1,6,-79,-1844,-13983,-61318,-162287,0,3667649,35570638,272475249,

%T 1957839572,13805455393,96826261890,678117659345,4747390650568,

%U 33232662134145,232630103648534,1628412985690417,11398894291501404,79792265017612001,558545862282195466

%N 7^n-n^7.

%C a(20)=79792265017612001 and a(24)=191581231375979942977 are primes, thus terms of A123206. - _M. F. Hasler_, Aug 20 2014

%H Vincenzo Librandi, <a href="/A024082/b024082.txt">Table of n, a(n) for n = 0..200</a>

%F G.f.: (1-9*x-85*x^2-407*x^3+5991*x^4+15665*x^5+8245*x^6+831*x^7+8*x^8)/((1-7*x)*(1-x)^8). - _Bruno Berselli_, May 16 2011

%t Table[7^n - n^7, {n, 0, 25}] (* _Stefan Steinerberger_, Apr 08 2006 *)

%o (Magma) [7^n-n^7: n in [0..25]]; // _Vincenzo Librandi_, May 16 2011

%Y Cf. A024012, A024026, A058794, A024040, A024054, A024068.

%K sign

%O 0,2

%A _N. J. A. Sloane_.

%E More terms from _Stefan Steinerberger_, Apr 08 2006