|
Search: id:A054215
|
|
|
| A054215 |
|
Squares that are concatenations of two consecutive decreasing numbers. |
|
+0
8
|
|
| 8281, 82848241, 98029801, 538277538276, 998002998001, 7783702677837025, 9998000299980001, 79225472657922547264, 86432513458643251344, 92237976109223797609, 99998000029999800001, 106710893290106710893289
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
FORMULA
|
a(n) = concatenation of A054214(n) and A054214(n)-1. - Max Alekseyev, May 14 2007
|
|
EXAMPLE
|
E.g. '8242' + '8242-1' gives 82428241 which is 9079^2.
|
|
CROSSREFS
|
Cf. A054214, A054216, A030465, A030466, A030467, A020339, A020340.
Sequence in context: A157731 A064014 A145527 this_sequence A031679 A031589 A031769
Adjacent sequences: A054212 A054213 A054214 this_sequence A054216 A054217 A054218
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
Patrick De Geest (pdg(AT)worldofnumbers.com), Feb 15 2000.
|
|
EXTENSIONS
|
More terms from Max Alekseyev, May 14 2007
|
|
|
Search completed in 0.002 seconds
|
