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A102205

Iccanobirt semiprimes (15 of 15): Semiprime numbers in A102125.

4, 5071, 6313, 31591, 9853, 11733, 31865, 736481, 9834802, 5123383, 906334841, 312395329, 73044385753, 39216355244851, 353123779923181, 944016528715333, 901870160743125919, 3394064622591216338731, 798539095539570459224764519, 5844680137439021618014007903

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..20.

FORMULA

a(n) = A102125(A102185(n)).

MATHEMATICA

nxt[{a_, b_, c_}]:=With[{ir=IntegerReverse}, {b, c, ir[ir[a]+ir[b]+ir[c]]}]; Select[NestList[nxt, {0, 0, 1}, 200][[;; , 1]], PrimeOmega[#]==2&] (* Harvey P. Dale, Jul 22 2025 *)

CROSSREFS

Cf. A001358, A102125, A102185, A102191-A102204.

Sequence in context: A344671 A203036 A306962 * A283663 A046360 A367942

Adjacent sequences: A102202 A102203 A102204 * A102206 A102207 A102208

KEYWORD

nonn,less,base

AUTHOR

Jonathan Vos Post and Ray Chandler, Dec 31 2004

EXTENSIONS

Offset changed to 1 and a(20) from Jinyuan Wang, Aug 14 2021

STATUS

approved

URL: https://oeis.org/A102205

⇱ A102205 - OEIS