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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
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.
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