A101765 Iccanobif semiprime indices: Indices of semiprime numbers in A014259.

8, 9, 15, 16, 18, 22, 32, 37, 46, 53, 61, 62, 64, 79, 82, 106, 121, 129, 149, 153, 229, 241, 266, 301, 381, 411, 502

Offset: 1

Author

Jonathan Vos Post and Ray Chandler, Dec 15 2004

Keywords

• nonn
• base
• hard
• more

Comments

This sequence also includes 742, 987, 1147, 1246, 1337, 1373, 1454, 1493, 1537, 1835, 1967, and 2265. It might or might not include 622, 630, 647, 817, 1247, 1402, 1422, 1477, 1649, 1781, 1818, 1867, 1874, and 2115, but the required factoring proved rather difficult. There are no further terms below 2265. - Lucas A. Brown, Nov 12 2022

Links

• Lucas A. Brown, A101765.py.

Crossrefs

Cf. A001358, A001129, A014258, A014259, A014260, A101763, A101764, A101766.

Extensions

a(27) from Lucas A. Brown, Nov 12 2022