A171530 Denominator of (n-th nonprime/n).

1, 1, 1, 1, 5, 3, 7, 4, 3, 5, 11, 3, 13, 7, 5, 16, 17, 2, 19, 2, 21, 2, 23, 24, 25, 13, 9, 7, 29, 15, 31, 16, 11, 34, 7, 12, 37, 19, 39, 5, 41, 21, 43, 22, 5, 23, 47, 8, 49, 50, 51, 13, 53, 18, 55, 8, 19, 29, 59, 30, 61, 62, 63, 64, 65, 11, 67, 17, 23, 35, 71, 3

Offset: 1

Author

Jaroslav Krizek, Dec 11 2009

Keywords

• nonn
• frac
• easy

Examples

			A018252(26) = 38, therefore a(26) = 38/26 = 19/13. - _Georg Fischer_, Mar 15 2025
		

Crossrefs

Cf. A018252, A171529 (numerator).

Formula

Denominator of (A018252(n)/n).

Extensions

a(26) corrected by Georg Fischer, Mar 15 2025