A076918 a(1) = 1, a(n+1) = A076271(n+1) divided by the highest common factor of A076271(n) and A076271(n+1).

1, 2, 2, 3, 3, 4, 5, 4, 5, 6, 7, 6, 7, 8, 9, 10, 11, 8, 9, 10, 11, 12, 13, 12, 13, 14, 15, 16, 17, 14, 15, 16, 17, 18, 19, 18, 19, 20, 21, 22, 23, 20

Offset

1,2

Comments

If a(k) is the first occurrence of a prime p(r), the r-th prime then a(k+1) = p(r-1) + 1,... a(k+m) = p(r-1) + m until a(k + p(r)-p(r-1))= p(r) again.( the second and the last occurrence of p(r)).

Links

Table of n, a(n) for n=1..42.

Crossrefs

Cf. A076271.

Sequence in context: A302515 A303314 A349122 * A162620 A304115 A338365

Adjacent sequences: A076915 A076916 A076917 * A076919 A076920 A076921

Keyword

nonn

Author

Amarnath Murthy, Oct 17 2002

Status

approved