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Search: id:A106497
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| A106497 |
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Numbers whose square is the concatenation of two identical numbers, i.e. of form NN. |
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+0
44
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| 36363636364, 45454545455, 54545454546, 63636363637, 72727272728, 81818181819, 90909090910, 428571428571428571429, 571428571428571428572, 714285714285714285715, 857142857142857142858
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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For the corresponding numbers N see A102567.
Numbers of the form j*(10^d+1)/k where 10^d+1 == 0 (mod k^2) and k/sqrt(10) < j < k. - David W. Wilson (davidwwilson(AT)comcast.net), Nov 09 2006
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LINKS
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David W. Wilson, Table of n, a(n) for n = 1..1098
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EXAMPLE
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63636363637 is in the sequence because 63636363637^2 = 4049586776940495867769 is 40495867769 written twice.
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CROSSREFS
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Sequence in context: A115502 A022262 A116279 this_sequence A038832 A038821 A139780
Adjacent sequences: A106494 A106495 A106496 this_sequence A106498 A106499 A106500
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KEYWORD
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base,nonn
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AUTHOR
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Lekraj Beedassy (blekraj(AT)yahoo.com), May 04 2005
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EXTENSIONS
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a(7) from Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), May 06 2005
More terms from David W. Wilson (davidwwilson(AT)comcast.net), Nov 05 2006
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