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A082210 Square root of the squares arising in A082209. 4
1, 4, 8, 7, 31, 248, 71, 4, 8, 7, 31, 248, 71, 4, 8, 7, 31, 248, 71, 4, 8, 7, 31, 248, 71, 4, 8, 7, 31, 248, 71, 4, 8, 7, 31, 248, 71, 4, 8, 7, 31, 248, 71, 4, 8, 7, 31, 248, 71, 4, 8, 7, 31, 248, 71, 4, 8, 7, 31, 248, 71, 4, 8, 7, 31, 248, 71, 4, 8, 7, 31, 248, 71, 4, 8, 7, 31, 248 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The squares are given in A090567. - M. F. Hasler, Nov 24 2015

LINKS

Table of n, a(n) for n=1..78.

Index entries for linear recurrences with constant coefficients, signature (0, 0, 0, 0, 0, 1).

FORMULA

a(n) = {A082209(n) concatenated with A082209(n+1)}^(1/2).

Periodic with period 6 from n=2 onward. - Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 20 2003

a(n) = sqrt(A090567(n)) with A090567(n) = A082209(n) concat A243091(A082209(n)). - M. F. Hasler, Nov 24 2015

EXAMPLE

a(3) = 31 = 961^(1/2) where A082209(3) = 9 and A082209(4) = 61.

MATHEMATICA

Join[{1}, LinearRecurrence[{0, 0, 0, 0, 0, 1}, {4, 8, 7, 31, 248, 71}, 77]] (* Ray Chandler, Aug 26 2015 *)

PROG

(PARI) A082210(n)=n<2||return([248, 71, 4, 8, 7, 31][n%6+1]) \\ M. F. Hasler, Nov 24 2015

CROSSREFS

Cf. A082209.

Sequence in context: A309665 A196205 A196141 * A196282 A196332 A245654

Adjacent sequences:  A082207 A082208 A082209 * A082211 A082212 A082213

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Apr 10 2003

EXTENSIONS

Corrected and extended by Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 20 2003

Definition corrected and minor edits by M. F. Hasler, Nov 24 2015

STATUS

approved

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Last modified July 29 13:28 EDT 2021. Contains 346346 sequences. (Running on oeis4.)