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Search: id:A115430
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| A115430 |
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Numbers n such that the concatenation of n with n+9 gives a square. |
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+0
19
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| 216, 287, 515, 675, 1175, 4320, 82640, 960795, 1322312, 4049591, 16955015, 34602080, 171010235, 181964891, 183673467, 187160072, 321920055, 326530616, 328818032, 343942560, 470954312, 526023432, 528925616, 534830855
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Also numbers n such that n concatenated with n+8 gives the product of two numbers which differ by 2.
Also numbers n such that n concatenated with n+5 gives the product of two numbers which differ by 4.
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EXAMPLE
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82640_82649 = 90907^2.
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CROSSREFS
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Cf. A030465, A102567, A115426, A115437, A115428, A115429, A115431, A115432, A115433, A115434, A115435, A115436, A115441.
Cf. A116172, A116168, A116344, A116112, A116193, A116173, A116323.
Adjacent sequences: A115427 A115428 A115429 this_sequence A115431 A115432 A115433
Sequence in context: A018863 A003998 A001239 this_sequence A043371 A074266 A066890
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KEYWORD
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base,nonn
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AUTHOR
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Giovanni Resta (g.resta(AT)iit.cnr.it), Jan 24 2006
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EXTENSIONS
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Edited by njas, Apr 13 2007
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