A116359 Numbers that can be written as sum of products of two successive primes.

6, 12, 15, 18, 21, 24, 27, 30, 33, 35, 36, 39, 41, 42, 45, 47, 48, 50, 51, 53, 54, 56, 57, 59, 60, 62, 63, 65, 66, 68, 69, 70, 71, 72, 74, 75, 76, 77, 78, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107

Offset: 1

Author

Reinhard Zumkeller, Feb 12 2006

Keywords

• nonn

Comments

A116357(a(n)) > 0; complement of A116358.

Examples

			45 = 2*3 + 2*3 + 2*3 + 2*3 + 2*3 + 3*5 =
= 3*5 + 3*5 + 3*5, therefore 45 is a term: A116357(45)=2.