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 A056964 a(n) = n + reversal of digits of n. 70
 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 11, 22, 33, 44, 55, 66, 77, 88, 99, 110, 22, 33, 44, 55, 66, 77, 88, 99, 110, 121, 33, 44, 55, 66, 77, 88, 99, 110, 121, 132, 44, 55, 66, 77, 88, 99, 110, 121, 132, 143, 55, 66, 77, 88, 99, 110, 121, 132, 143, 154, 66, 77, 88, 99, 110 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS If n has an even number of digits then a(n) is a multiple of 11. Also called the Reverse and Add!, or RADD operation. Iteration of this function leads to the definition of Lychrel and related numbers, cf. A023108, A063048, A088753, A006960, and many others. - M. F. Hasler, Apr 13 2019 LINKS Indranil Ghosh, Table of n, a(n) for n = 0..20000 (first 1001 terms from T. D. Noe) Eric Weisstein's World of Mathematics, Reverse-Then-Add Sequence FORMULA a(n) = n + A004086(n) = 2*n - A056965(n). n < a(n) < 11n for n > 0. - Charles R Greathouse IV, Nov 17 2022 EXAMPLE a(17) = 17 + 71 = 88. MATHEMATICA Table[n+FromDigits[Reverse[IntegerDigits[n]]], {n, 0, 100}] (* Harvey P. Dale, Jul 19 2014 *) PROG (Haskell) a056964 n = n + a004086 n -- Reinhard Zumkeller, Oct 14 2011 (PARI) A056964(n)=fromdigits(Vecrev(digits(n)))+n \\ Charles R Greathouse IV, Oct 28 2014 (Python) def A056964(n): return n+int(str(n)[::-1]) # Indranil Ghosh, Jan 29 2017 CROSSREFS Cf. A004086, A056965, A067030. Differs from A052008 when n=101 and a(101)=202 while A052008(101)=121 Cf. A036839. Sequence in context: A262223 A070196 A345111 * A052008 A117463 A248609 Adjacent sequences: A056961 A056962 A056963 * A056965 A056966 A056967 KEYWORD nonn,base,easy AUTHOR Henry Bottomley, Jul 18 2000 STATUS approved

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Last modified December 3 09:50 EST 2022. Contains 358517 sequences. (Running on oeis4.)