A102178 Iccanobirt semiprime indices (8 of 15): Indices of semiprime numbers in A102118.

5, 9, 11, 16, 17, 18, 20, 30, 31, 41, 43, 54, 68, 69, 84, 135, 139, 174, 188, 191, 203, 207, 243, 301, 356

Offset: 1

Author

Jonathan Vos Post and Ray Chandler, Dec 31 2004

Keywords

• nonn
• more
• less
• base

Crossrefs

Cf. A001358, A102118, A102171-A102185, A102198.

Formula

A102118(a(n)) = A102198(n).

Extensions

a(21)-a(22) from Robert Price, Nov 09 2018

Offset changed to 1 and a(23)-a(25) from Jinyuan Wang, Aug 14 2021