A101763 - OEIS

%I #29 Nov 21 2022 09:38:08

%S 8,10,15,17,35,37,47,53,62,66,74,79,110,127,146,214,231,241,242,245,

%T 250,277,293,302,343,485,525,550,599,638,687,733,805,814

%N Iccanobif semiprime indices: Indices of semiprime numbers in A001129.

%C 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

%H Lucas A. Brown, <a href="https://github.com/lucasaugustus/oeis/blob/main/A101763.py">A101763.py</a>.

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

%K nonn,base,hard,more

%O 1,1

%A _Jonathan Vos Post_ and _Ray Chandler_, Dec 15 2004

%E Missing 302 inserted and 525 added by _Sean A. Irvine_, Apr 29 2022

%E a(28)-a(34) from _Lucas A. Brown_, Nov 21 2022