|
%I #11 Apr 14 2021 08:57:07
%S 3,4,23,29,39,1559,1593,2435519,2435534,2485805,2485806,2485810,
%T 2485827,2486989,5936893149287,5936893149290,5936949030071,
%U 5936949030092,5936949030103,5936949030105,5936949030115,5936949030121,35246700334321411113125039,1242329884457453073932774588160466662938743561876559
%N Numbers k such that A260815(k) > A260815(k-1)+1.
%e a(3) = 23 is in the sequence because A260815(23) - A260815(22) = 575 - 46 > 1.
%p G:= proc(nv)
%p local n,v,k,np;
%p n:= nv[1]; v:= nv[2];
%p k:= min(seq((-n-1) mod p, p = numtheory:-factorset(v-n-1)));
%p np:= n+k+1;
%p [np, v+k+igcd(np,v+k)^2]
%p end proc:
%p R:= 3: t:= [3,12]:
%p for i from 2 to 24 do
%p t:= G(t);
%p R:= R, t[1];
%p od:
%p R;
%t 2 + Position[Differences @ Nest[Append[#1, #1[[-1]] + GCD[#2, #1[[-1]]]^2] & @@ {#, Length[#] + 2} &, {3}, 10000], _?(# > 1 &)] // Flatten (* _Amiram Eldar_, Apr 14 2021 after _Michael De Vlieger_ at A260815 *)
%Y Cf. A260815.
%K nonn
%O 1,1
%A _Robert Israel_, Apr 13 2021
|
