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A090062 There is (presumably) one and only one palindrome in the Reverse and Add! trajectory of n. 0

%I #5 Mar 30 2012 17:27:41

%S 89,98,167,187,266,286,365,385,479,563,578,583,662,677,682,749,761,

%T 776,779,781,829,860,869,875,880,899,928,947,968,974,977,998,1077,

%U 1093,1098,1167,1183,1188,1257,1273,1278,1297,1347,1363,1368,1387,1396,1397,1437

%N There is (presumably) one and only one palindrome in the Reverse and Add! trajectory of n.

%C For terms < 2000 the only palindrome is reached from the start in at most 24 steps; thereafter 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 479 begins 479, 1453, 4994, 9988, 18887, ...; at 9988 it joins the (presumably) palindrome-free trajectory of A063048(3) = 1997, hence 4994 is the only palindrome in the trajectory of 479 and 479 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 May 3 16:04 EDT 2024. Contains 372221 sequences. (Running on oeis4.)