A205667 Numbers containing exactly one prime in decimal representation.

2, 3, 5, 7, 11, 12, 15, 19, 20, 21, 22, 24, 26, 28, 30, 33, 34, 36, 38, 39, 41, 42, 45, 50, 51, 54, 55, 56, 58, 61, 62, 63, 65, 70, 74, 76, 77, 78, 82, 85, 87, 89, 92, 93, 95, 101, 102, 105, 109, 110, 111, 114, 116, 118, 120, 121, 122, 124, 126, 128, 141

Offset: 1

Author

Reinhard Zumkeller, Jan 31 2012

Keywords

• nonn
• base

Comments

A039997(a(n)) = 1.

Examples

			A039997(10) = #{} = 0, therefore 10 is not a term;
A039997(11) = #{11} = 1, therefore 11 is a term;
A039997(12) = #{2} = 1, therefore 12 is a term;
A039997(13) = #{3, 13} = 2, therefore 13 is not a term.
		

Links

• Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Crossrefs

Subsequence of A163753.

Programs

Haskell

a205667 n = a205667_list !! (n-1)
a205667_list = filter ((== 1) . a039997) [0..]
-- Reinhard Zumkeller, Jan 31 2012