A120313 a(n) = Product of k primes in arithmetic progression with common difference 6, otherwise a(n) = prime(n).

2, 3, 623645, 124729, 11339, 19, 667, 29, 49321, 1591, 43, 146969, 3127, 59, 23569729, 386389, 71, 5767

Offset

1,1

Links

Table of n, a(n) for n=1..18.

Example

a(2) = 3 because 3+6 = 9 and is not prime;
a(3) = 623645 = 5*11*17*23*29 and the common difference between successive primes is 6.

Crossrefs

Sequence in context: A038537 A338404 A235984 * A216981 A307255 A176649

Adjacent sequences: A120310 A120311 A120312 * A120314 A120315 A120316

Keyword

nonn

Author

Giovanni Teofilatto, Jun 20 2006

Status

approved