The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A080818 Triangle read by rows in which the n-th row contains n distinct numbers whose sum is the smallest square. 3
 1, 1, 3, 1, 2, 6, 1, 2, 3, 10, 1, 2, 3, 4, 6, 1, 2, 3, 4, 5, 10, 1, 2, 3, 4, 5, 6, 15, 1, 2, 3, 4, 5, 6, 7, 8, 1, 2, 3, 4, 5, 6, 7, 8, 13, 1, 2, 3, 4, 5, 6, 7, 8, 9, 19, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 26, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 15, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 22, 1, 2, 3, 4, 5, 6, 7, 8 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS If n(n+1)/2 is a square triangular number then the n-th row contains first n natural numbers (e.g., the 8th row). LINKS EXAMPLE 1; 1,3; 1,2,6; 1,2,3,10; 1,2,3,4,6; 1,2,3,4,5,10; 1,2,3,4,5,6,15; 1,2,3,4,5,6,... MAPLE seq(op([seq(i, i=1..n-1), (ceil(sqrt(n*(n+1)/2)))^2 - n*(n-1)/2]), n=1..15); # C. Ronaldo CROSSREFS Cf. A080817, A080819, A080820. Sequence in context: A112571 A051277 A300908 * A334354 A052417 A130509 Adjacent sequences:  A080815 A080816 A080817 * A080819 A080820 A080821 KEYWORD nonn,tabl AUTHOR Amarnath Murthy, Mar 21 2003 EXTENSIONS More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 19 2004 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified January 27 23:41 EST 2022. Contains 350654 sequences. (Running on oeis4.)