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A130052
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Numbers that are the sum of one or more consecutive squares in more than one way.
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8
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25, 365, 841, 1405, 1730, 2030, 3281, 3655, 3740, 4510, 4705, 4760, 4900, 5244, 5434, 5915, 5929, 7230, 7574, 8415, 8464, 9385, 11055, 11236, 11900, 12325, 12524, 14905, 16745, 17484, 18879, 19005, 19044, 19855, 20449, 20510, 21790, 22806, 23681
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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EXAMPLE
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25 = 3^2 + 4^2 = 5^2.
365 = 10^2 + 11^2 + 12^2 = 13^2 + 14^2.
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PROG
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(PARI) ok(n) = {my(i=sqrtint(n), m=0); while(i>0&&m<2, my(a=i^2, j=i); while(j>0&&a<=n, if(a==n, m+=1); j-=1; a=a+j^2); i-=1); return(m>1)}
{for(p=1, 24000, if(ok(p), print1(p, ", ")))} \\ Antonio Roldán, Mar 09 2020
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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