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

1,1

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

Table of n, a(n) for n=1..34.

Lucas A. Brown, A101763.py.

Crossrefs

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

Sequence in context: A228946 A100718 A063190 * A154568 A020940 A287557

Adjacent sequences: A101760 A101761 A101762 * A101764 A101765 A101766

Keyword

nonn,base,hard,more

Author

Jonathan Vos Post and Ray Chandler, Dec 15 2004

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

Status

approved