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

1,1

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

Table of n, a(n) for n=1..27.

Lucas A. Brown, A101765.py.

Crossrefs

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

Sequence in context: A323249 A257037 A114305 * A306490 A256351 A050688

Adjacent sequences: A101762 A101763 A101764 * A101766 A101767 A101768

Keyword

nonn,base,hard,more

Author

Jonathan Vos Post and Ray Chandler, Dec 15 2004

Extensions

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

Status

approved