2,1

Records are in A040040. - Andres Cicuttin, Nov 26 2016

Table of n, a(n) for n=2..73.

a(n) = floor(p(n+1)/(p(n+1)-p(n))) = ceiling(p(n)/(p(n+1)-p(n))), where p(n) is the n-th prime. - Leroy Quet, Feb 03 2007

a(n) = A113709(n)/A001223(n). - Omar E. Pol, Nov 26 2016

Between the primes 67 and 71 is the composite 68 and 68 is divisible by (71-67)=4. So 68/(71-67)= 17 is in the sequence.

Cf. A113709.

Sequence in context: A097914 A286633 A286586 * A286587 A054126 A323507

Adjacent sequences: A113707 A113708 A113709 * A113711 A113712 A113713

nonn

Leroy Quet, Nov 06 2005

More terms from R. J. Mathar, Aug 31 2007

approved