A102200 Iccanobirt semiprimes (10 of 15): Semiprime numbers in A102120.

4, 53122, 412441, 2360934421, 2982905123, 1968515515, 8282454457, 17281502461, 88998294238681, 858342429826762, 2350396241873433799, 25572406084465911331237801, 52170015710352407496920694341, 798986767053692909522422712521, 718154384550161644441959876349

Offset

1,1

Links

Table of n, a(n) for n=1..15.

Formula

a(n) = A102120(A102180(n)).

Mathematica

nxt[{a_, b_, c_}]:={b, c, IntegerReverse[c+IntegerReverse[b]+a]}; Select[NestList[nxt, {0, 0, 1}, 100][[All, 1]], PrimeOmega[#]==2&] (* Harvey P. Dale, Nov 17 2024 *)

Crossrefs

Cf. A001358, A102120, A102180, A102191-A102205.

Sequence in context: A259492 A074318 A276718 * A257769 A370683 A066544

Adjacent sequences: A102197 A102198 A102199 * A102201 A102202 A102203

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 14 2021

Status

approved