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A260255 Numbers that can be written as the sum of two nonnegative palindromes in base 10. 13
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
COMMENTS
More than the usual number of terms are shown in order to distinguish this from A261906. - N. J. A. Sloane, Sep 09 2015
A260254(a(n)) > 0.
LINKS
MATHEMATICA
palQ[n_Integer, base_Integer] := Block[{}, Reverse[idn = IntegerDigits[n, base]] == idn]; Take[ Union[ Plus @@@ Tuples[ Select[ Range[0, 100], palQ[#, 10] &], 2]], 90] (* Robert G. Wilson v, Jul 22 2015 *)
PROG
(Haskell)
a260255 n = a260255_list !! (n-1)
a260255_list = filter ((> 0) . a260254) [0..]
CROSSREFS
Cf. A035137 (complement), A260254, A002113.
111 is a member of this sequence but not of A261906. A213879 lists the differences.
Sequence in context: A338555 A338331 A318535 * A261906 A179239 A287478
KEYWORD
nonn,base
AUTHOR
Reinhard Zumkeller, Jul 21 2015
STATUS
approved

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Last modified February 29 17:30 EST 2024. Contains 370428 sequences. (Running on oeis4.)