A177689 - OEIS

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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

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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).

LINKS

Table of n, a(n) for n=1..35.

FORMULA

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

CROSSREFS

Cf. A000040, A002110, A006862, A038609.

Sequence in context: A301523 A105756 A152057 * A191611 A281678 A118622

Adjacent sequences: A177686 A177687 A177688 * A177690 A177691 A177692

KEYWORD

easy,nonn

AUTHOR

Jonathan Vos Post, May 11 2010

STATUS

approved