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Smallest prime which is 1 more than the product of n (not necessarily distinct) composite numbers.
3

%I #7 Jan 08 2019 09:12:41

%S 2,5,17,97,257,3457,12289,40961,65537,786433,5308417,14155777,

%T 104857601,167772161,1811939329,3221225473,24159191041,77309411329,

%U 206158430209,2061584302081,2748779069441,6597069766657,39582418599937

%N Smallest prime which is 1 more than the product of n (not necessarily distinct) composite numbers.

%e a(0) = 1 + 1 = 2, a(3) = 4*4*6 + 1 = 97.

%Y Cf. A081545.

%K hard,nonn

%O 0,1

%A _Amarnath Murthy_, Apr 01 2003

%E More terms from _Michel ten Voorde_ Jun 13 2003

%E Added missing term 12289 and a(13)-a(22) from _Donovan Johnson_, Nov 05 2009