id:A102261 - OEIS Search Results

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a(n) = A002144(n) - A002145(n).

+0
4

2, 6, 6, 10, 14, 10, 10, 14, 14, 22, 26, 22, 26, 10, 30, 22, 26, 34, 30, 30, 30, 50, 42, 42, 46, 46, 50, 42, 42, 50, 46, 54, 42, 42, 42, 42, 38, 34, 30, 38, 14, 18, 18, 18, 46, 54, 62, 70, 78, 78, 90, 78, 66, 54, 70, 66, 62, 66, 58, 70, 66, 86, 98, 78, 78, 54, 70, 70, 78, 78 (list; graph; listen)

	OFFSET	`1,1`
	MAPLE	`A002144 := proc(n) option remember ; if n = 1 then RETURN(5) ; fi; for a from procname(n-1)+2 do if isprime(a) and (a mod 4 = 1 ) then RETURN(a) ; fi; od: end; A002145 := proc(n) option remember ; if n = 1 then RETURN(3) ; fi; for a from procname(n-1)+2 do if isprime(a) and (a mod 4 = 3 ) then RETURN(a) ; fi; od: end; A102261 := proc(n) A002144(n)-A002145(n) ; end: seq(A102261(n), n=1..120) ; [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 07 2009]`
	CROSSREFS	`Sequence in context: A006955 A063210 A114718 this_sequence A147298 A078636 A083482` `Adjacent sequences: A102258 A102259 A102260 this_sequence A102262 A102263 A102264`
	KEYWORD	`nonn`
	AUTHOR	`Paul Curtz (bpcrtz(AT)free.fr), Sep 06 2008`
	EXTENSIONS	`Edited by N. J. A. Sloane (njas(AT)research.att.com), Sep 06 2008` `More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 07 2009`

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Last modified November 21 21:21 EST 2009. Contains 167310 sequences.

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