This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A098879 #16 Feb 16 2025 08:32:54
%S A098879 -2,-1,241,16805,759373,28629149,992436541,33038369405,1078203909373,
%T A098879 34842114263549,1120413075641341,35940921946155005,
%U A098879 1151514816750309373,36870975646169341949,1180231376725002502141,37773167607267111108605,1208833588708967444709373
%N A098879 a(n) = (2^n - 1)^5 - 2.
%C A098879 5th-power analog of what for exponent 2 is A093112 (2^n-1)^2 - 2 = 4^n - 2^{n+1} - 1 and exponent 3 is A098878 (2^n - 1)^3 - 2. Primes include a(n) for n = 0, 2, 5, 6. These are "near-5th-power prime." Semiprimes include a(n) for n = 3, 8, 9, 10, 13, 15, 21, 29, 33, 40. - _Jonathan Vos Post_, May 03 2006
%H A098879 Harvey P. Dale, <a href="/A098879/b098879.txt">Table of n, a(n) for n = 0..664</a>
%H A098879 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Near-SquarePrime.html">Near-Square Prime.</a>
%H A098879 <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (63, -1302, 11160, -41664, 64512, -32768).
%F A098879 G.f.: (-2+125*x-2300*x^2+22640*x^3-57728*x^4+66560*x^5)/((-1+x)(-1+32*x)(-1+16*x)(-1+8*x)(-1+4*x)(-1+2*x)). - _R. J. Mathar_, Nov 14 2007
%e A098879 If n=2, (2^2 - 1)^5 - 2 = 241 (a prime).
%t A098879 (2^Range[0,20]-1)^5-2 (* or *) LinearRecurrence[{63,-1302,11160,-41664,64512,-32768},{-2,-1,241,16805,759373,28629149},20] (* _Harvey P. Dale_, Nov 03 2016 *)
%o A098879 (PARI) a(n)=(2^n-1)^5-2 \\ _Charles R Greathouse IV_, Feb 19 2016
%Y A098879 Cf. A091516, A091515, A098878, A091514.
%K A098879 easy,sign
%O A098879 0,1
%A A098879 _Parthasarathy Nambi_, Oct 13 2004
%E A098879 More terms from _Jonathan Vos Post_, May 03 2006
%E A098879 Edited by _N. J. A. Sloane_, Sep 30 2007