id:A031150 - OEIS Search Results

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Appending a digit to n^2 gives another perfect square.

+0
2

1, 2, 4, 5, 6, 12, 18, 43, 80, 154, 191, 228, 456, 684, 1633, 3038, 5848, 7253, 8658, 17316, 25974, 62011, 115364, 222070, 275423, 328776, 657552, 986328, 2354785, 4380794, 8432812, 10458821, 12484830, 24969660, 37454490 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Square root of 'Squares from A023110 with last digit removed'.`
	EXAMPLE	`5^2 = 25 and 16^2 = 256, so 5 is in the sequence. 115364^2 = 13308852496, 364813^2 = 133088524969`
	MAPLE	`for i from 1 to 150000 do if (floor(sqrt(10 * i^2 + 9)) > floor(sqrt(10 * i^2))) then print(i) end if end do;`
	CROSSREFS	`Cf. A023110, A030686, A030687, A053784.` `Sequence in context: A113631 A101951 A006539 this_sequence A125775 A058637 A026473` `Adjacent sequences: A031147 A031148 A031149 this_sequence A031151 A031152 A031153`
	KEYWORD	`nonn`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com)`

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Last modified July 25 02:12 EDT 2008. Contains 142294 sequences.

AT&T Labs Research