id:A082209 - OEIS Search Results

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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.

+0
4

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; listen)

	OFFSET	`1,2`
	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 (ppl(AT)spl.at), Nov 27 2006`
	EXAMPLE	`a(3) = 9 hence a(4) = 61 and 961= 31^2.`
	CROSSREFS	`Cf. A082210.` `Sequence in context: A113276 A086034 A021943 this_sequence A143520 A075450 A145979` `Adjacent sequences: A082206 A082207 A082208 this_sequence A082210 A082211 A082212`
	KEYWORD	`base,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 10 2003`
	EXTENSIONS	`Corrected and extended by Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 20 2003`

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Last modified December 16 13:01 EST 2009. Contains 170825 sequences.

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