id:A163505 - OEIS Search Results

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n-th odd nonprime mod n-th odd number.

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0, 0, 0, 0, 7, 5, 7, 5, 5, 7, 7, 5, 5, 3, 5, 3, 3, 5, 3, 3, 3, 1, 1, 46, 46, 48, 52, 1, 1, 58, 58, 58, 58, 58, 60, 62, 62, 66, 66, 66, 66, 70, 70, 72, 72, 74, 76, 76, 78, 78, 82, 82, 82, 86, 90, 90, 90, 90, 90, 92, 92, 92, 92, 92, 94, 98, 100, 100, 104, 104, 104, 104, 106, 106 (list; graph; listen)

	OFFSET	`1,5`
	FORMULA	`a(n)= A014076(n) mod A005408(n-1).`
	EXAMPLE	`a(1)= 1 mod 1 =0. a(2) = 9 mod 3 =0. a(3) = 15 mod 5 =0. a(4)= 21 mod 7 =0. a(5)=(25 mod 9)=7.`
	MAPLE	`A014076 := proc(n) option remember; local a; if n = 1 then 1; else for a from procname(n-1)+2 by 2 do if not isprime(a) then return a; end if; end do: end if; end proc:` `A163505 := proc(n) A014076(n) mod (2*n-1); end: seq(A163505(n), n=1..80) ; # R. J. Mathar, Oct 10 2009`
	CROSSREFS	`Cf. A005408, A014076.` `Sequence in context: A110943 A021573 A080411 this_sequence A021136 A143297 A072449` `Adjacent sequences: A163502 A163503 A163504 this_sequence A163506 A163507 A163508`
	KEYWORD	`nonn`
	AUTHOR	`Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Jul 29 2009`
	EXTENSIONS	`Formula index corrected by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 10 2009`

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

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