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A089307 Smallest prime of the form 1+n*(n+n_2)*...*(n+n_n) with 1<=n_2<n_3<...<n_n. A089308 gives terms of products. 1

%I #6 Dec 05 2013 19:56:35

%S 2,7,61,1201,15121,332641,9313921,319334401,10897286401,419026608001,

%T 14079294028801,647647525324801,34972966367539201,2017671136588800001,

%U 108416195739371520001,6707348643075784704001,440955772120958814720001

%N Smallest prime of the form 1+n*(n+n_2)*...*(n+n_n) with 1<=n_2<n_3<...<n_n. A089308 gives terms of products.

%e a(4)=1201 because 1201 is the smallest prime that can be written as 1 + product of 4 strictly increasing terms and smallest term 4: 1201=1+4*5*6*10.

%Y Cf. A089308.

%K nonn

%O 1,1

%A _Amarnath Murthy_, Nov 01 2003

%E More terms from _Hugo Pfoertner_, Apr 06 2004

%E Further terms from _David Wasserman_, Sep 09 2005

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Last modified March 28 08:22 EDT 2024. Contains 371236 sequences. (Running on oeis4.)