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A054214
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Numbers n such that n concatenated with n-1 is a square.
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9
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82, 8242, 9802, 538277, 998002, 77837026, 99980002, 7922547265, 8643251345, 9223797610, 9999800002, 106710893290, 453378226757, 491023832065, 945958034530, 999998000002, 11916002265170, 15790977390245, 24917378001937
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Every term contains even number of digits. - Max Alekseyev, May 14 2007
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EXAMPLE
| E.g. '8242' + '8242-1' gives 82428241 which is 9079^2.
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CROSSREFS
| Cf. A054215, A054216, A030465, A030466, A030467, A020339, A020340.
Sequence in context: A097841 A116123 A116142 * A093241 A176024 A204976
Adjacent sequences: A054211 A054212 A054213 * A054215 A054216 A054217
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KEYWORD
| nonn,base
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AUTHOR
| Patrick De Geest (pdg(AT)worldofnumbers.com), Feb 15 2000.
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EXTENSIONS
| More terms from Max Alekseyev, May 14 2007
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