A175250 Nonprimes (A018252) with noncomposite (A008578) subscripts.

1, 4, 6, 9, 12, 18, 21, 26, 28, 34, 42, 45, 52, 57, 60, 65, 74, 81, 84, 91, 95, 98, 106, 112, 119, 128, 133, 135, 141, 143

Offset: 1

Author

Jaroslav Krizek, Mar 13 2010

Keywords

• nonn

Comments

a(n) = nonprime(noncomposite(n)) = A018252(A008578(n)). a(n) U A102615(n+1) = A018252(n) for n >= 1. a(1) = 1, a(n) = A078782(n-1) = nonprimes (A008578) with prime (A000040) subscripts for n >=2.

Examples

			a(5) = 12 because a(5) = b(q(5)) = b(7) = 12, q = noncomposite, b = nonprime.