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Search: id:A046950
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| 1, 25, 49, 169, 625, 1369, 3025, 7921, 18769, 37249, 208849, 3485689, 4950625, 7756225, 225150025, 48195616225, 264353307409, 453673643809, 1278932548201
(list; graph; listen)
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OFFSET
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0,2
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PROGRAM
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(PARI) B=1; for (n=1, 200000, t1=divisors(2*n); t2=0; for (i=1, length(t1), if( t1[ i ]%4 <> 0, t2=t2+t1[ i ])); B=B+8*t2; if (issquare(B), print("B is square ", B)))
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CROSSREFS
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Sequence in context: A137659 A020325 A108604 this_sequence A146641 A056981 A132585
Adjacent sequences: A046947 A046948 A046949 this_sequence A046951 A046952 A046953
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KEYWORD
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nonn,nice
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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More terms from Jason Earls (zevi_35711(AT)yahoo.com), Jul 21 2001
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