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 A284811 Fixed points of the transform A267193. 2
 18, 27, 36, 45, 54, 63, 72, 81, 90, 1098, 1188, 1278, 1368, 1458, 1548, 1638, 1728, 1818, 1908, 2097, 2187, 2277, 2367, 2457, 2547, 2637, 2727, 2817, 2907, 3096, 3186, 3276, 3366, 3456, 3546, 3636, 3726, 3816, 3906, 4095, 4185, 4275, 4365, 4455, 4545, 4635, 4725 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS These numbers are called antipalindromic in base 10 by Dvorakova et al. - Michel Marcus, Aug 18 2020 LINKS Rémy Sigrist, Table of n, a(n) for n = 1..9999 Lubomira Dvorakova, Stanislav Kruml, and David Ryzak, Antipalindromic numbers, arXiv:2008.06864 [math.CO], 2020. EXAMPLE 1278 is a term of the sequence because its complement in base 10 is 8721 and the digit reversal is again 1278. MAPLE P:=proc(q, h) local a, b, k, n; for n from 1 to q do a:=convert(n, base, h); b:=0; for k from 1 to nops(a) do a[k]:=h-1-a[k]; b:=h*b+a[k]; od; if b=n then print(n); fi; od; end: P(10^2, 10); PROG (PARI) isok(m) = {my(d=digits(m)); for (j=1, #d, if (d[j] + d[#d+1-j] != 9, return(0)); ); return (1); } \\ Michel Marcus, Aug 18 2020 (PARI) a(n) = my (d=digits(n)); n*10^#d + fromdigits(apply (t -> 9-t, Vecrev(d))) \\ Rémy Sigrist, Aug 18 2020 CROSSREFS Cf. A035928, A061601, A267193. Subsequence of A008591 (multiples of 9). Sequence in context: A262277 A144777 A296130 * A257001 A109911 A239878 Adjacent sequences:  A284808 A284809 A284810 * A284812 A284813 A284814 KEYWORD nonn,base,easy AUTHOR Paolo P. Lava, Apr 05 2017 STATUS approved

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Last modified May 18 05:16 EDT 2021. Contains 343994 sequences. (Running on oeis4.)