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 A090068 Numbers n such that there are (presumably) seven palindromes in the Reverse and Add! trajectory of n. 0
 6, 13, 16, 25, 31, 34, 40, 43, 44, 52, 61, 70, 77, 104, 111, 115, 145, 158, 200, 202, 203, 214, 244, 250, 257, 302, 356, 399, 401, 412, 414, 442, 455, 498, 500, 505, 511, 519, 529, 541, 554, 597, 610, 618, 626, 628, 640, 653, 656, 686, 752, 795, 797, 816, 826 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS 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. LINKS Table of n, a(n) for n=1..55. Index entries for sequences related to Reverse and Add! EXAMPLE The trajectory of 25 begins 25, 77, 154, 605, 1111, 2222, 4444, 8888, 17776, 85547, 160105, 661166, 1322332, 3654563,7309126, ...; at 7309126 it joins the (presumably) palindrome-free trajectory of A063048(7) = 10577, hence 77, 1111, 2222, 4444, 8888, 661166 and 3654563 are the seven palindromes in the trajectory of 25 and 25 is a term. CROSSREFS Cf. A023108, A023109, A065001, A070742, A077594. Sequence in context: A140888 A053753 A228380 * A070899 A265756 A332988 Adjacent sequences: A090065 A090066 A090067 * A090069 A090070 A090071 KEYWORD nonn,base AUTHOR Klaus Brockhaus, Nov 20 2003 STATUS approved

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Last modified September 18 02:51 EDT 2024. Contains 375995 sequences. (Running on oeis4.)