

A121911


First four terms are decimal digits of 1979. Rest are found by adding four previous terms modulo 10.


0



1, 9, 7, 9, 6, 1, 3, 9, 9, 2, 3, 3, 7, 5, 8, 3, 3, 9, 3, 8, 3, 3, 7, 1, 4, 5, 7, 7, 3, 2, 9, 1, 5, 7, 2, 5, 9, 3, 9, 6, 7, 5, 7, 5, 4, 1, 7, 7, 9, 4, 7, 7, 7, 5, 6, 5, 3, 9, 3, 0, 5, 7, 5, 7, 4, 3, 9, 3, 9, 4, 5, 1, 9, 9, 4, 3, 5, 1, 3, 2, 1, 7, 3, 3, 4, 7, 7, 1, 9, 4, 1, 5, 9, 9, 4, 7, 9, 9, 9, 4, 1, 3, 7, 5, 6
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OFFSET

1,2


COMMENTS

Sequence is periodic with period length 1560. a(n) is even iff n is a multiple of 5.  (Klaus Brockhaus, Sep 06 2006)


LINKS

Table of n, a(n) for n=1..105.


FORMULA

a(1) = 1, a(2) = 9, a(3) = 7, a(4) = 9; for n >= 5, a(n) = (a(n1) + a(n2) + a(n3) + a(n4)) (mod 10)


CROSSREFS

Sequence in context: A094132 A243263 A244691 * A010547 A011405 A268228
Adjacent sequences: A121908 A121909 A121910 * A121912 A121913 A121914


KEYWORD

easy,nonn,base


AUTHOR

Stephen J Sugden (ssugden(AT)gmail.com), Sep 02 2006


EXTENSIONS

Extended by Klaus Brockhaus, Sep 06 2006


STATUS

approved



