A083772 Primes arising in A083771.

3, 7, 31, 211, 2311, 43891, 1272811, 16546531, 976245271, 36121074991, 1119753324691, 52628406260431, 3526103219448811, 186883470630786931, 7662222295862264131, 743235562698639620611, 54256196077000692304531

Offset: 1

Author

Amarnath Murthy and Meenakshi Srikanth (menakan_s(AT)yahoo.com), May 06 2003

Keywords

• nonn

Crossrefs

Cf. A039726, A083771.

Programs

PARI

{ terms=20; a=A083771=vector(terms); A083771[1]=2; tmp=1; a[1]=3; for(k=2,terms, tmp=tmp*A083771[k-1]; p=1; while(1, until(isprime(p), p=p+2); for(m=1,k-1, if(p==A083771[m], break, if(m==k-1, if(isprime(tmp*p+1), A083771[k]=p; a[k]=tmp*p+1; print1(a[k],","); break(2))))))); a }

Extensions

More terms from Rick L. Shepherd, Mar 18 2004