Ljunggren, Wilhelm New solution of a problem proposed by E. Lucas. (English) Zbl 0047.04102 Norsk Mat. Tidsskr. 34, 65-72 (1952). Reviewer: N. Hofreiter Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 2 ReviewsCited in 4 Documents MSC: 11D25 Cubic and quartic Diophantine equations Keywords:cubic Diophantine equation; packing of congruent spheres in a square pyramid Citations:JFM 46.0213.01 PDFBibTeX XMLCite \textit{W. Ljunggren}, Norsk Mat. Tidsskr. 34, 65--72 (1952; Zbl 0047.04102) Online Encyclopedia of Integer Sequences: Numbers k such that sum of squares of k consecutive integers >= 1 is a square. Distance from the n-th square pyramidal number (sum of the first n positive squares) to the nearest square. Numbers that are square or square pyramidal.