A102203 Iccanobirt semiprimes (13 of 15): Semiprime numbers in A102123.

4, 26, 49, 1651, 44311, 38141, 45901, 990681, 8041777, 60558487, 8252802091, 1348187591, 11280376871, 49455591538, 1658081357516741, 15268848817955861, 6791980801494070261, 8278821177559776598, 759117158185214871379, 47088657278621730593201, 187491222710962870446779

Offset: 1

Author

Jonathan Vos Post and Ray Chandler, Dec 31 2004

Keywords

• nonn
• less
• base

Crossrefs

Cf. A001358, A102123, A102183, A102191-A102205.

Formula

a(n) = A102123(A102183(n)).

Extensions

Offset changed to 1 and more terms from Jinyuan Wang, Aug 15 2021