A240510 Numbers whose "reverse and add" process becomes palindromic at 8813200023188.
89, 98, 187, 286, 385, 583, 682, 781, 869, 880, 968, 1297, 1387, 1477, 1567, 1657, 1747, 1837, 1927, 2296, 2386, 2476, 2566, 2656, 2746, 2836, 2926, 3295, 3385, 3475, 3565, 3655, 3745, 3835, 3925, 4294, 4384, 4474, 4564, 4654, 4744, 4834, 4924, 5293, 5383
Offset: 1
References
- David Wells, The Penguin Dictionary of Curious and Interesting Numbers. Penguin Books, NY, 1986, Revised edition 1987. See p. 143.
Links
- Daniel Starodubtsev, Table of n, a(n) for n = 1..100000 (terms 1..177 from Robert Price)
- Felix Fröhlich, C++ program for this sequence.
Programs
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Mathematica
limit = 10^3; (* Assumes that there is no palindrome if none is found before "limit" iterations *) Select[Range[0, 50000], (np = #; i = 0; While[ ! PalindromeQ[np] && i < limit, np = np + IntegerReverse[np]; i++]; np == 8813200023188) &] (* Robert Price, Oct 16 2019 *) -
PARI
is(n)=my(k=8813200023188); while(n<=k && (d=digits(n))!=(r=Vecrev(d)), n+=fromdigits(r)); n==k; \\ Charles R Greathouse IV, Apr 09 2020
Extensions
More terms from Jon E. Schoenfield, Apr 12 2014
Comments