%I A071580
%S A071580 2,3,7,43,3613,65250781,5109197227031017,
%T A071580 21753246920584523633819544186061,
%U A071580 993727878334632126576336773629979379563850938567846991629270287
%N A071580 Smallest prime == 1 mod (a(n-1)*a(n-2)*...*a(1)) for n>=2 with a(1)=2.
%C A071580 a(6) through a(13), with digit lengths 8, 16, 32, 63, 127, 253, 507 and 
               1012, respectively, have been certified prime with Primo.
%o A071580 (PARI) terms=13; v=vector(terms); p=2; v[1]=p; for(n=2,terms, q=p+1; 
               while(!isprime(q), q=q+p); v[n]=q; p=p*q); v
%Y A071580 Cf. A061092.
%Y A071580 Sequence in context: A000058 A075442 A082993 this_sequence A014546 A068393 
               A032053
%Y A071580 Adjacent sequences: A071577 A071578 A071579 this_sequence A071581 A071582 
               A071583
%K A071580 nonn
%O A071580 1,1
%A A071580 Rick L. Shepherd (rshepherd2(AT)hotmail.com), May 31 2002