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A244323 Iterates of A234742, starting from value a(0) = 23, with a(1) = A234742(a(0)), a(2) = A234742(a(1)), etc. 5

%I

%S 23,39,99,279,775,1271,3003,26411,45059,53219,96811,180063,538083,

%T 1557987,2994571,5394027,76600323,78603291,646326135,5260930155,

%U 11705029515,55771437087,918661840551,2662267345431,156054629431431,1885162669463151,2739827178329319,23916267980687775,343334160580618935

%N Iterates of A234742, starting from value a(0) = 23, with a(1) = A234742(a(0)), a(2) = A234742(a(1)), etc.

%C The sequence reaches its fixed point at a(55) = 3643749709604450870616156947649219, after which the sequence stays constant, a(55) = a(56) = a(57), etc.

%H Antti Karttunen, <a href="/A244323/b244323.txt">Table of n, a(n) for n = 0..56</a>

%o (PARI)

%o A234742(n)=factorback(subst(lift(factor(Mod(1, 2)*Pol(binary(n)))), x, 2))+(n==1)

%o iterates_of_A234742(start,filename) = {my(n=start,prev=-1,prevprev=-1,i=0); until((n==prevprev), write(filename, i, " ", n); prevprev = prev; prev = n; n = A234742(n); i++)} \\ Computes b-file up to the second occurrence of the fixed point.

%o iterates_of_A234742(23,"b244323.txt")

%Y Cf. A234742, A235033, A235035, A260712, A260713, A260716.

%Y Cf. also A260729, A260735, A260441 (other such iterations).

%K nonn

%O 0,1

%A _Antti Karttunen_ and _M. F. Hasler_, Jul 23 2014

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Last modified May 29 20:42 EDT 2020. Contains 334710 sequences. (Running on oeis4.)