A102192 Iccanobirt semiprimes (2 of 15): Semiprime numbers in A102112.

4, 62, 885229, 1246986214, 6411178063, 12726051979, 107213343921600529, 2147942208584833933, 10354578286673927897, 58980651512479169892243191, 2180545853785440701368914883, 16670504896204082873702933353, 1970627022928300844150934760319, 8848738313604306954943751816182969

Offset

1,1

Links

Table of n, a(n) for n=1..14.

Formula

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

Mathematica

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 *)

Crossrefs

Cf. A001358, A102112, A102191-A102205.

Sequence in context: A284158 A202630 A102196 * A102197 A094323 A286438

Adjacent sequences: A102189 A102190 A102191 * A102193 A102194 A102195

Keyword

nonn,less,base

Author

Jonathan Vos Post and Ray Chandler, Dec 31 2004

Extensions

Offset changed to 1 and more terms from Jinyuan Wang, Aug 08 2021

Status

approved