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Other cases: k=1 A001223 Differences between consecutive primes, k=2 A059787, k=3 A114245, k=4 A114246, k=5 A114247, k=6 A114248, k=7 A111739, k=8 A111740, k=10 A111742.
Table of n, a(n) for n=1..95.
a(1)=1 because prime(1)=2 and 9*2+1=19 (prime).
Cf. A001223, A059787, A114245, A114246, A114247, A114248, A111739, A111740, A111742.
Sequence in context: A152061 A103314 A194560 * A111793 A064482 A067228
Adjacent sequences: A111738 A111739 A111740 * A111742 A111743 A111744
Zak Seidov, Nov 18 2005