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

23, 39, 99, 279, 775, 1271, 3003, 26411, 45059, 53219, 96811, 180063, 538083, 1557987, 2994571, 5394027, 76600323, 78603291, 646326135, 5260930155, 11705029515, 55771437087, 918661840551, 2662267345431, 156054629431431, 1885162669463151, 2739827178329319, 23916267980687775, 343334160580618935

Offset: 0

Author

Antti Karttunen and M. F. Hasler, Jul 23 2014

Keywords

• nonn

Comments

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

Links

• Antti Karttunen, Table of n, a(n) for n = 0..56

Crossrefs

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

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

Programs

PARI

A234742(n)=factorback(subst(lift(factor(Mod(1, 2)*Pol(binary(n)))), x, 2))+(n==1)
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.
iterates_of_A234742(23,"b244323.txt")