id:A163975 - OEIS Search Results

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n-th nonprime-(-1)^(n-th nonprime).

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	OFFSET	`1,2`
	FORMULA	`a(n)=A141468(n)-(-1)^A141468(n).` `a(n)= A103889(A141468(n)), n>0.`
	EXAMPLE	`a(1)=0-(-1)^0=-1. a(2)=1-(-1)^1=2.`
	MAPLE	`A103889 := proc(n) n-(-1)^n ; end:` `A141468 := proc(n) option remember ; if n <= 2 then n-1 ; else for a from procname(n-1)+1 do if not isprime(a) then RETURN(a); fi; od: fi; end:` `A163975 := proc(n) A103889(A141468(n)) ; end: seq( A163975(n), n=1..120) ;`
	CROSSREFS	`Cf. A141468.` `Sequence in context: A036959 A108031 A076387 this_sequence A125975 A046758 A121232` `Adjacent sequences: A163972 A163973 A163974 this_sequence A163976 A163977 A163978`
	KEYWORD	`sign,easy`
	AUTHOR	`Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Aug 07 2009`
	EXTENSIONS	`Entries checked by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 29 2009`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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