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A131507
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2n+1 appears n+1 times.
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11
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1, 3, 3, 5, 5, 5, 7, 7, 7, 7, 9, 9, 9, 9, 9, 11, 11, 11, 11, 11, 11, 13, 13, 13, 13, 13, 13, 13, 15, 15, 15, 15, 15, 15, 15, 15, 17, 17, 17, 17, 17, 17, 17, 17, 17, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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COMMENTS
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LINKS
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FORMULA
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EXAMPLE
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As a triangle, the sequence starts:
1;
3, 3;
5, 5, 5;
7, 7, 7, 7;
9, 9, 9, 9, 9;
...
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MAPLE
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seq(2*floor(sqrt(2*n+1)+1/2)-1, n=0..70); # Ridouane Oudra, Oct 20 2019
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MATHEMATICA
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PROG
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(Haskell)
a131507 n k = a131507_tabl !! n !! k
a131507_row n = a131507_tabl !! n
a131507_tabl = zipWith ($) (map replicate [1..]) [1, 3 ..]
a131507_list = concat a131507_tabl
(Chipmunk BASIC v3.6.4(b8)) # http://www.nicholson.com/rhn/basic/
for n=1 to 23 step 2
for j=1 to n step 2
print str$(n)+", ";
next j : next n : print
end
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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