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A082209
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a(1) = 1, a(n) = smallest number such that the concatenation of a(n-1) and a(n) is a square.
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3
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1, 6, 4, 9, 61, 504, 1, 6, 4, 9, 61, 504, 1, 6, 4, 9, 61, 504, 1, 6, 4, 9, 61, 504, 1, 6, 4, 9, 61, 504, 1, 6, 4, 9, 61, 504, 1, 6, 4, 9, 61, 504, 1, 6, 4, 9, 61, 504, 1, 6, 4, 9, 61, 504, 1, 6, 4, 9, 61, 504, 1, 6, 4, 9, 61, 504, 1, 6, 4, 9, 61, 504, 1, 6, 4, 9, 61, 504, 1, 6, 4, 9, 61
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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FORMULA
| Periodic with period 6. - Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 20 2003
a(n)=1/6*{542*(n mod 6)-404*[(n+1) mod 6]-13*[(n+2) mod 6]+34*[(n+3) mod 6]+41*[(n+4) mod 6]+34*[(n+5) mod 6]} with n>=0 - Paolo P. Lava (paoloplava(AT)gmail.com), Nov 27 2006
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EXAMPLE
| a(3) = 9 hence a(4) = 61 and 961= 31^2.
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CROSSREFS
| Cf. A082210.
Sequence in context: A021943 A168198 A177898 * A143520 A075450 A145979
Adjacent sequences: A082206 A082207 A082208 * A082210 A082211 A082212
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KEYWORD
| base,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 10 2003
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EXTENSIONS
| Corrected and extended by Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 20 2003
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