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Search: id:A106586
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| A106586 |
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Digit next to last in squares ending in 6. |
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+0
1
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| 1, 3, 9, 5, 7, 7, 5, 9, 3, 1, 1, 3, 9, 5, 7, 7, 5, 9, 3, 1, 1, 3, 9, 5, 7, 7, 5, 9, 3, 1, 1, 3, 9, 5, 7, 7, 5, 9, 3, 1, 1, 3, 9, 5, 7, 7, 5, 9, 3, 1, 1, 3, 9, 5, 7, 7, 5, 9, 3, 1, 1, 3, 9, 5, 7, 7, 5, 9, 3, 1, 1, 3, 9, 5, 7, 7, 5, 9, 3, 1, 1, 3, 9, 5, 7, 7, 5, 9, 3, 1, 1, 3, 9, 5, 7, 7, 5, 9, 3, 1, 1, 3, 9, 5, 7
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Entries are always one of the odd digits 1,3,5,7,9.
Palindrome of period 10. [From Paul Curtz (bpcrtz(AT)free.fr), Jan 04 2009]
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FORMULA
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a(n)=(1/45)*{5*(n mod 10)+14*[(n+1) mod 10]+32*[(n+2) mod 10]-13*[(n+3) mod 10]+14*[(n+4) mod 10]+5*[(n+5) mod 10]-4*[(n+6) mod 10]+23*[(n+7) mod 10]-22*[(n+8) mod 10]-4*[(n+9) mod 10]}, wirh n>=0 [From Paolo P. Lava (ppl(AT)spl.at), Jan 19 2009]
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MATHEMATICA
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Mod[Floor[ #^2/10], 10] & /@ Select[Range[700], Mod[ #^2, 10] == 6 &] (*Chandler*)
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CROSSREFS
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Cf. A000290.
Sequence in context: A070341 A085851 A092041 this_sequence A010633 A096418 A100811
Adjacent sequences: A106583 A106584 A106585 this_sequence A106587 A106588 A106589
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KEYWORD
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nonn
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AUTHOR
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Lekraj Beedassy (blekraj(AT)yahoo.com), May 10 2005
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EXTENSIONS
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Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), May 13 2005
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