A122879 - OEIS

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A122879

Periodic sequence of period 21.

0, 0, 0, 0, 1, 1, 1, 2, 2, 2, 2, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 0, 0, 0, 0, 1, 1, 1, 2, 2, 2, 2, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 0, 0, 0, 0, 1, 1, 1, 2, 2, 2, 2, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 0, 0, 0, 0, 1, 1, 1, 2, 2, 2, 2, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 0, 0, 0, 0, 1, 1, 1, 2, 2, 2, 2, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,8`
	COMMENTS	`See related comments in A122878.`
	FORMULA	`a(n+21) = a(n).` `a(n)=(1/210){21(n mod 21)+[(n+1) mod 21]+[(n+2) mod 21]-9[(n+3) mod 21]+[(n+4) mod 21]+[(n+5) mod 21]+[(n+6) mod 21]-9[(n+7) mod 21]+[(n+8) mod 21]+[(n+9) mod 21)+21[(n+10) mod 21]+[(n+11) mod 21]+[(n+12) mod 21]+[(n+13) mod 21]-9[(n+14) mod 21]+[(n+15) mod 21]+[(n+16) mod 21]-9*[(n+17) mod 21]+[(n+18) mod 21]+[(n+19) mod 21]+[(n+20) mod 21]}, with n>=0 [From Paolo P. Lava (paoloplava(AT)gmail.com), Oct 23 2008]`
	CROSSREFS	`Cf. A122878.` `Sequence in context: A128207 A180958 A037867 * A037866 A205777 A053398` `Adjacent sequences: A122876 A122877 A122878 * A122880 A122881 A122882`
	KEYWORD	`nonn`
	AUTHOR	`Rick L. Shepherd (rshepherd2(AT)hotmail.com), Sep 16 2006`

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Last modified February 13 22:36 EST 2012. Contains 205567 sequences.