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A102174 Iccanobirt semiprime indices (4 of 15): Indices of semiprime numbers in A102114. 1

%I #18 Aug 11 2021 01:25:36

%S 5,11,18,33,35,37,43,44,56,63,93,148,175,176,204,288,317

%N Iccanobirt semiprime indices (4 of 15): Indices of semiprime numbers in A102114.

%F A102114(a(n)) = A102194(n).

%t nxt[{a_,b_,c_}]:={b,c,IntegerReverse[c]+b+a};Flatten[Position[ NestList[ nxt,{0,0,1},200][[All,1]],_?(PrimeOmega[#]==2&)]]-1 (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, May 16 2018 *)

%Y Cf. A001358, A102114, A102171-A102185, A102194.

%K nonn,more,less,base

%O 1,1

%A _Jonathan Vos Post_ and _Ray Chandler_, Dec 31 2004

%E a(15) from _Robert Price_, Nov 08 2018

%E Offset changed to 1 and a(16)-a(17) from _Jinyuan Wang_, Aug 10 2021

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Last modified March 28 13:25 EDT 2024. Contains 371254 sequences. (Running on oeis4.)