A102192 - OEIS

%I #13 Aug 08 2021 06:24:34

%S 4,62,885229,1246986214,6411178063,12726051979,107213343921600529,

%T 2147942208584833933,10354578286673927897,58980651512479169892243191,

%U 2180545853785440701368914883,16670504896204082873702933353,1970627022928300844150934760319,8848738313604306954943751816182969

%N Iccanobirt semiprimes (2 of 15): Semiprime numbers in A102112.

%F a(n) = A102112(A102172(n)).

%t nxt[{a_,b_,c_}]:={b,c,a+IntegerReverse[b]+c};Select[NestList[nxt,{0,0,1},100][[All,1]],PrimeOmega[#]==2&] (* _Harvey P. Dale_, Jul 11 2021 *)

%Y Cf. A001358, A102112, A102191-A102205.

%K nonn,less,base

%O 1,1

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

%E Offset changed to 1 and more terms from _Jinyuan Wang_, Aug 08 2021