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A065983
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Palindromes whose digit sum is 4.
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0
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4, 22, 121, 202, 1111, 2002, 10201, 11011, 20002, 101101, 110011, 200002, 1002001, 1010101, 1100011, 2000002, 10011001, 10100101, 11000011, 20000002, 100020001, 100101001, 101000101, 110000011, 200000002, 1000110001, 1001001001
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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There are ceiling(k/2) terms with k digits and so floor(n^2/4) terms with fewer than k digits. Writing the terms as a vertical column and then blanking zeros produces a narrow triangle with upward chevrons.
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LINKS
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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STATUS
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approved
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