A177689 Sums of 2 distinct primorials.

3, 7, 8, 31, 32, 36, 211, 212, 216, 240, 2311, 2312, 2316, 2340, 30031, 30032, 30036, 30060, 30240, 32340, 510511, 510512, 510516, 510540, 510720, 512820, 540540, 9699691, 9699692, 9699696, 9699720, 9699900, 9702000, 9729720, 10210200

Offset: 1

Author

Jonathan Vos Post, May 11 2010

Keywords

• easy
• nonn

Comments

This is to numbers that are the sum of 2 different primes (A038609) as primorials (A002110) are to primes (A000040). The subsequence of primes among these sums of 2 distinct primorials is the sequence of primorial primes (A018239) which is the same as the subsequence of primes among the Euclid numbers (A006862).

Crossrefs

Cf. A000040, A002110, A006862, A038609.

Formula

{a(n)} = {A002110(i) + A002110(j) for i =/= j}.