login
A177689
Sums of 2 distinct primorials.
4
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
1,1
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).
FORMULA
{a(n)} = {A002110(i) + A002110(j) for i =/= j}.
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Jonathan Vos Post, May 11 2010
STATUS
approved