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Twin primes modulo 4.

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3, 1, 3, 3, 1, 1, 3, 1, 3, 1, 3, 3, 1, 3, 1, 1, 3, 3, 1, 1, 3, 1, 3, 3, 1, 3, 1, 1, 3, 3, 1, 3, 1, 1, 3, 1, 3, 3, 1, 3, 1, 3, 1, 3, 1, 1, 3, 1, 3, 1, 3, 3, 1, 1, 3, 1, 3, 3, 1, 1, 3, 1, 3, 3, 1, 1, 3, 1, 3, 3, 1, 3, 1, 1, 3, 1, 3, 3, 1, 3, 1, 1, 3, 1, 3, 1, 3, 1, 3, 3, 1, 3, 1, 3, 1, 1, 3, 3, 1, 3, 1, 3, 1, 3, 1 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`The twin primes are 3,5,7,11,13,17,19,... and mod 4 is 3,1,3,3,1,1,3...`
	MAPLE	`a[1]:=3:i:=2:for k from 5 to 3000 do if isprime(k) and isprime(k+2) then a[i]:=k mod 4:a[i+1]:=k+2 mod 4: i:=i+2 fi od: seq(a[n], n=1..i-1);`
	CROSSREFS	`Cf. A001097.` `Sequence in context: A112164 A075676 A124814 this_sequence A122431 A089607 A050141` `Adjacent sequences: A122564 A122565 A122566 this_sequence A122568 A122569 A122570`
	KEYWORD	`nonn`
	AUTHOR	`Miklos Kristof (kristmikl(AT)freemail.hu), Sep 21 2006`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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