A102183 Iccanobirt semiprime indices (13 of 15): Indices of semiprime numbers in A102123.

5, 9, 12, 15, 16, 17, 19, 21, 25, 28, 33, 35, 37, 46, 61, 63, 70, 71, 81, 82, 89, 90, 100, 103, 106, 121, 133, 147, 204, 212, 220, 263, 293, 311

Offset: 1

Author

Jonathan Vos Post and Ray Chandler, Dec 31 2004

Keywords

• nonn
• base
• more
• less

Comments

No more terms through 200.

Crossrefs

Cf. A001358, A102123, A102171-A102185, A102203.

Formula

A102123(a(n)) = A102203(n).

Extensions

a(29)-a(31) from Robert Price, Nov 10 2018

Offset changed to 1 and a(32)-a(34) from Jinyuan Wang, Aug 15 2021