A175247 Primes (A000040) with noncomposite (A008578) subscripts.

2, 3, 5, 11, 17, 31, 41, 59, 67, 83, 109, 127, 157, 179, 191, 211, 241, 277, 283, 331, 353, 367, 401, 431, 461, 509, 547, 563, 587, 599, 617, 709, 739, 773, 797, 859, 877, 919, 967, 991, 1031, 1063, 1087, 1153, 1171, 1201, 1217, 1297, 1409, 1433, 1447

Offset: 1

Author

Jaroslav Krizek, Mar 13 2010

Keywords

• nonn

Comments

A006450 is the main entry for these numbers. [Arkadiusz Wesolowski, Mar 12 2011]

Examples

			a(5) = 17 because a(5) = p(q(5)) = p(7) = 17, p = prime, q = noncomposite.
		

Crossrefs

Cf. A006450, A000040.

Formula

a(n) U A007821(n+1) = A000040(n) for n >= 1. a(n) = prime(noncomposite(n)) = A000040(A008578(n)). a(1) = 2, a(n) = A006450(n-1) for n >= 2.