A101763 Iccanobif semiprime indices: Indices of semiprime numbers in A001129.

8, 10, 15, 17, 35, 37, 47, 53, 62, 66, 74, 79, 110, 127, 146, 214, 231, 241, 242, 245, 250, 277, 293, 302, 343, 485, 525, 550, 599, 638, 687, 733, 805, 814

Offset: 1

Author

Jonathan Vos Post and Ray Chandler, Dec 15 2004

Keywords

• nonn
• base
• hard
• more

Comments

This sequence also includes 881, 946, 954, 1086, 1753, and 1771. It might or might not include 838, 849, 1073, 1667, 1741, 1870, 2155, and 2478, but the required factoring proved rather difficult. There are no further terms below 2478. - Lucas A. Brown, Nov 19 2022

Links

• Lucas A. Brown, A101763.py.

Crossrefs

Cf. A001358, A001129, A014258, A014259, A014260, A101764, A101765, A101766.

Extensions

Missing 302 inserted and 525 added by Sean A. Irvine, Apr 29 2022

a(28)-a(34) from Lucas A. Brown, Nov 21 2022