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A261906 Numbers that are the sum of two nonzero palindromes. 7
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, 112, 113, 114, 115, 116, 117, 118, 119, 120 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

More than the usual number of terms are shown in order to distinguish this from A260255.

LINKS

Table of n, a(n) for n=1..110.

EXAMPLE

22 is a member because it is the sum of two palindromes, 11+11 (not because it is a palindrome in its own right).

111 is not the sum of two nonzero palindromes, so appears in A260255 but not here. See A213879 for further differences between the two sequences.

MAPLE

# Sums of two nonzero pals:

# bP has a list of palindromes starting at 0.

a2:={}; M:=60; M2:=bP[M];

for i from 2 to M do

for j from i to M do

k:=bP[i]+bP[j];

if k <= M2 then a2:={op(a2), k}; fi;

od: od:

b2:=sort(convert(a2, list));

CROSSREFS

Cf. A002113, A260255, A213879.

Sequence in context: A089869 A318535 A260255 * A179239 A287478 A135579

Adjacent sequences:  A261903 A261904 A261905 * A261907 A261908 A261909

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane, Sep 09 2015

STATUS

approved

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Last modified February 21 18:05 EST 2020. Contains 332107 sequences. (Running on oeis4.)