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%I #21 Sep 08 2022 08:46:13
%S 3,5,65,16777217,1329227995784915872903807060280344577
%N a(n) = 2^(n!) + 1.
%C a(n) is a sum of two k-th powers of positive integers for k=1,2,...,n.
%F a(n) = 2^(n!) + 1.
%F a(n) = A050923(n) + 1.
%e a(3) = 2^6 + 1 = 65.
%o (PARI) first(m)=vector(m,i,2^(i!)+1); /* _Anders Hellström_, Aug 08 2015 */
%o (Magma) [2^(Factorial(n)) + 1: n in [1..6]]; // _Vincenzo Librandi_, Aug 09 2015
%Y Cf. A050923.
%K nonn,easy
%O 1,1
%A _Marco Ripà_, Aug 08 2015
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