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Search: id:A089951
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| A089951 |
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Numbers having the same leading decimal digits as their squares. |
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+0
4
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| 0, 1, 10, 11, 12, 13, 14, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 895
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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A000030(a(n)) = A002993(a(n)) = A000030(A000290(a(n))).
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FORMULA
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A number n is in the sequence iff n = 0 or n/10^[log10(n)] lies in one of the half-open intervals [1, sqrt(2)), [sqrt(80), 9) or [sqrt(90), 10). - David Wilson (davidwwilson(AT)comcast.net), May 29 2008
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EXAMPLE
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895*895 = 801025, therefore 895 is a term: a(55)=895.
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CROSSREFS
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Cf. A018834.
A143464. [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 17 2008]
Sequence in context: A057947 A073527 A008707 this_sequence A058945 A072554 A138582
Adjacent sequences: A089948 A089949 A089950 this_sequence A089952 A089953 A089954
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KEYWORD
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nonn,base
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jan 12 2004
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