|
| |
|
|
A115430
|
|
Numbers n such that the concatenation of n with n+9 gives a square.
|
|
18
| |
|
|
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; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
COMMENTS
| 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.
|
|
|
EXAMPLE
| 82640_82649 = 90907^2.
|
|
|
CROSSREFS
| Cf. A030465, A102567, A115426, A115437, A115428, A115429, A115431, A115432, A115433, A115434, A115435, A115436, A115441.
Cf. A116172, A116168, A116344, A116112, A116193, A116173, A116323.
Sequence in context: A184088 A205191 A204650 * A179419 A043371 A074266
Adjacent sequences: A115427 A115428 A115429 * A115431 A115432 A115433
|
|
|
KEYWORD
| base,nonn
|
|
|
AUTHOR
| Giovanni Resta (g.resta(AT)iit.cnr.it), Jan 24 2006
|
|
|
EXTENSIONS
| Edited by N. J. A. Sloane (njas(AT)research.att.com), Apr 13 2007
|
| |
|
|
