id:A000689 - OEIS Search Results

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Final decimal digit of 2^n.

+0
3

1, 2, 4, 8, 6, 2, 4, 8, 6, 2, 4, 8, 6, 2, 4, 8, 6, 2, 4, 8, 6, 2, 4, 8, 6, 2, 4, 8, 6, 2, 4, 8, 6, 2, 4, 8, 6, 2, 4, 8, 6, 2, 4, 8, 6, 2, 4, 8, 6, 2, 4, 8, 6, 2, 4, 8, 6, 2, 4, 8, 6, 2, 4, 8, 6, 2, 4, 8, 6, 2, 4, 8, 6, 2, 4, 8, 6, 2, 4, 8, 6 (list; graph; listen)

	OFFSET	`0,2`
	LINKS	`Index entries for sequences related to final digits of numbers`
	FORMULA	`Periodic with period 4.` `a(n)=(1/6){8(i mod 4)-[(i+1) mod 4]+2[(i+2) mod 4]+11[(i+3) mod 4]}-5*{1-[((i+1)!+1) mod (i+1)]}, with n>=0. - Paolo P. Lava (ppl(AT)spl.at), Jun 25 2007`
	MAPLE	`P:=proc(n) local a, i; for i from 0 by 1 to n do a:=1/6(8(i mod 4)-((i+1) mod 4)+2((i+2) mod 4)+11((i+3) mod 4))-5*(1-(((i+1)!+1) mod (i+1))); print(a); od; end: P(100); - Paolo P. Lava (ppl(AT)spl.at), Jun 25 2007`
	CROSSREFS	`Adjacent sequences: A000686 A000687 A000688 this_sequence A000690 A000691 A000692` `Sequence in context: A036117 A116624 A125733 this_sequence A132137 A011180 A103546`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified November 8 07:45 EST 2009. Contains 166143 sequences.

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