1,1

a(1)=97 because is the first prime such that p(n)-p(n-1)+1 is not prime. (97-89+1=15, and 15 is not prime)

Cf. A000040 (the prime numbers), A001223 (difference between primes)

Sequence in context: A140830 A038133 A144325 this_sequence A073076 A157213 A000923

Adjacent sequences: A161364 A161365 A161366 this_sequence A161368 A161369 A161370

nonn

Leonardo Sznajder (leonardosznajder(AT)yahoo.com.ar), Jun 08 2009