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A090066 Numbers n such that there are (presumably) five palindromes in the Reverse and Add! trajectory of n. 0

%I #9 Nov 30 2013 11:48:19

%S 14,15,23,24,32,41,42,50,51,55,60,66,79,97,105,106,107,119,120,123,

%T 129,130,131,140,141,152,159,161,171,176,179,181,184,185,199,204,205,

%U 206,218,228,251,258,269,275,278,283,284,290,298,304,305,317,319,321,327

%N Numbers n such that there are (presumably) five palindromes in the Reverse and Add! trajectory of n.

%C For terms < 2000 each palindrome is reached from the preceding one or from the start in at most 24 steps; after the presumably last one no further palindrome is reached in 2000 steps.

%H <a href="/index/Res#RAA">Index entries for sequences related to Reverse and Add!</a>

%e The trajectory of 106 begins 106, 707, 1414, 5555, 11110, 12221, 24442, 48884, 97768, ...; at 97768 it joins the (presumably) palindrome-free trajectory of A063048(3) = 1997, hence 707, 5555, 12221, 24442 and 48884 are the five palindromes in the trajectory of 106 and 106 is a term.

%Y Cf. A023108, A023109, A065001, A070742, A077594.

%K nonn,base

%O 1,1

%A _Klaus Brockhaus_, Nov 20 2003

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Last modified April 19 12:14 EDT 2024. Contains 371792 sequences. (Running on oeis4.)