A140899 Period 10: repeat [7, 9, 5, 1, 3, 3, 1, 5, 9, 7].

7, 9, 5, 1, 3, 3, 1, 5, 9, 7, 7, 9, 5, 1, 3, 3, 1, 5, 9, 7, 7, 9, 5, 1, 3, 3, 1, 5, 9, 7, 7, 9, 5, 1, 3, 3, 1, 5, 9, 7, 7, 9, 5, 1, 3, 3, 1, 5, 9, 7, 7, 9, 5, 1, 3, 3, 1, 5, 9, 7, 7, 9, 5, 1, 3, 3, 1, 5, 9, 7, 7, 9, 5, 1, 3, 3, 1, 5, 9, 7, 7, 9, 5, 1, 3, 3, 1, 5, 9, 7

Offset

0,1

Comments

The sequence a(2n) + a(2n+1) = period 5: repeat 16, 6, 6, 6, 16.

A140724 = period 10: repeat 1, 5, 9, 7, 7, 9, 5, 1, 3, 3. a(n) is one of its two palindromic decuplets.

Links

Table of n, a(n) for n=0..89.

Index entries for linear recurrences with constant coefficients, signature (2,-2,2,-2,1).

Formula

a(n) = A140724(n+4).

a(n) = a(n-10).

Mathematica

PadRight[{}, 100, {7, 9, 5, 1, 3, 3, 1, 5, 9, 7}] (* Paolo Xausa, May 25 2026 *)

Prog

(PARI) a(n)=[7, 9, 5, 1, 3, 3, 1, 5, 9, 7][n%10+1] \\ Charles R Greathouse IV, Jul 13 2016

Crossrefs

Sequence in context: A361972 A395844 A198756 * A201925 A021561 A216104

Adjacent sequences: A140896 A140897 A140898 * A140900 A140901 A140902

Keyword

nonn,easy

Author

Paul Curtz, Jul 24 2008

Status

approved