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 A109678 Sequence and first differences include all square numbers exactly once. 0
 1, 5, 14, 30, 55, 91, 140, 204, 285, 385, 506, 650, 819, 1015, 1240, 1496, 1785, 2109, 2470, 2870, 3311, 3795, 4324, 4900, 5525, 6201, 6930, 7714, 8555, 9455, 10416, 11440, 12529, 13685, 14910, 16206, 17575, 19019, 20540, 22140, 23821, 25585 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS This sequence diverges from A000330 as 4900 (which is 70^2) appears in the sequence itself - thus won't be added to any a(n). LINKS EXAMPLE Superpose sequence and first differences: 1 5 14 30 55 91 140 204 285 385 506 650 819 1015 .4.9..16..25..36..49...64...81...100...121...144...169...196 All square numbers appear once and only once, either in the sequence itself or in the first differences. CROSSREFS Sequence in context: A231681 A231685 A074784 * A000330 A266783 A266784 Adjacent sequences:  A109675 A109676 A109677 * A109679 A109680 A109681 KEYWORD easy,nonn AUTHOR Eric Angelini, Aug 30 2005 EXTENSIONS Two programs removed that were reproducing A000330 and therefore erroneous. - R. J. Mathar, Mar 06 2013 STATUS approved

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Last modified June 1 03:14 EDT 2020. Contains 334758 sequences. (Running on oeis4.)