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A122567
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Twin primes modulo 4.
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0
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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; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| The twin primes are 3,5,7,11,13,17,19,... and mod 4 is 3,1,3,3,1,1,3...
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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);
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CROSSREFS
| Cf. A001097.
Sequence in context: A112164 A075676 A124814 * A122431 A089607 A050141
Adjacent sequences: A122564 A122565 A122566 * A122568 A122569 A122570
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KEYWORD
| nonn
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AUTHOR
| Miklos Kristof (kristmikl(AT)freemail.hu), Sep 21 2006
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