A102201 Iccanobirt semiprimes (11 of 15): Semiprime numbers in A102121.

4, 581, 427, 8621, 16342, 253486367, 2219057821, 27297112754, 89359826467, 111725421271, 81491456587747, 65683774724947682, 3657883767310690921, 324958155565178050832783011, 7599185976546928443534740942821, 3638796960899657009455220564046301

Offset: 1

Author

Jonathan Vos Post and Ray Chandler, Dec 31 2004

Keywords

• nonn
• less
• base

Crossrefs

Cf. A001358, A102121, A102181, A102191-A102205.

Formula

a(n) = A102121(A102181(n)).

Extensions

Offset changed to 1 and a(16) from Jinyuan Wang, Aug 14 2021