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 A290329 Iterate the map x -> A289667(x) starting at n; sequence gives primes reached, or -1 if no prime is ever reached. 4
 2, 3, 71, 5, 71, 7, 71, 11, 23, 11, 5261, 13, 17, 23, 703455573449, 17, 703455573449, 19, 5261, 71, 703455573449, 23, 727, 17, 67, 21544131687786037881228990839860266551231, 79, 29, 21544131687786037881228990839860266551231, 31, 23, 239, 71, 229, 227, 37, 73 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,1 COMMENTS Base 3 analog of A195264 and A230627. LINKS Chai Wah Wu, Table of n, a(n) for n = 2..47 MAPLE A290329 := proc(n)     local nitr ;     nitr := n ;     while ( not isprime(nitr) and nitr <> 1) do         nitr := A289667(nitr) ;     end do:     return nitr ; end proc: seq(A290329(n), n=1..20) ; # R. J. Mathar, Aug 05 2017 MATHEMATICA Table[NestWhile[FromDigits[#, 3] &@ Flatten@ Map[IntegerDigits[#, 3] &, FactorInteger[#] /. {p_, e_} /; p > 0 :> If[e == 1, p, {p, e}]] &, n, ! PrimeQ@ # &], {n, 2, 38}] (* Michael De Vlieger, Jul 29 2017 *) CROSSREFS Cf. A290328, A230627, A289667. Sequence in context: A257173 A232618 A115892 * A145531 A140546 A234237 Adjacent sequences:  A290326 A290327 A290328 * A290330 A290331 A290332 KEYWORD nonn,base AUTHOR Chai Wah Wu, Jul 27 2017 STATUS approved

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Last modified September 17 11:47 EDT 2021. Contains 347477 sequences. (Running on oeis4.)