The On-Line Encyclopedia of Integer Sequences (OEIS)

A244323 revision #8

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

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OFFSET

0,1

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

PROG

(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")

CROSSREFS

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

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

Sequence in context: A134755 A345277 A209985 * A337871 A227174 A050657

Adjacent sequences: A244320 A244321 A244322 * A244324 A244325 A244326

KEYWORD

nonn

AUTHOR

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

STATUS

editing