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%I #14 Apr 27 2024 16:47:23
%S 2,3,5,13,313,101,181,5419,21523361,52579,212601841,57154490053,
%T 815702161,100621,4454215139669,4562284561,52548582913,
%U 1895634885375961,211573,2272727294381,415710882920521,9299179,1853387306082786629,22496867303759173834520497
%N a(n) is the largest prime factor of n^n + n.
%F a(n) = A006530(A066068(n)).
%t Table[f = FactorInteger[n^n + n]; f[[Length[f]]][[1]], {n, 1, 25}] (* _Vaclav Kotesovec_, Apr 26 2024 *)
%o (Python)
%o from sympy import primefactors
%o def A372228(n): return max(max(primefactors(n),default=1),max(primefactors(n**(n-1)+1))) # _Chai Wah Wu_, Apr 27 2024
%Y Cf. A066068, A006530, A006486, A007571, A372229.
%K nonn
%O 1,1
%A _Tyler Busby_, Apr 23 2024
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