A102172 Iccanobirt semiprime indices (2 of 15): Indices of semiprime numbers in A102112.

5, 9, 20, 29, 31, 32, 51, 54, 56, 76, 81, 83, 89, 98, 139, 145, 292, 314

Offset: 1

Author

Jonathan Vos Post and Ray Chandler, Dec 31 2004

Keywords

• nonn
• more
• less
• base

Crossrefs

Cf. A001358, A102112, A102171-A102185, A102192.

Formula

A102112(a(n)) = A102192(n).

Extensions

Offset changed to 1 and a(17)-a(18) from Jinyuan Wang, Aug 08 2021