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A122564 Twin primes of form 4k-1, 4k+1. 2
3, 5, 11, 13, 59, 61, 71, 73, 107, 109, 179, 181, 191, 193, 227, 229, 239, 241, 311, 313, 347, 349, 419, 421, 431, 433, 599, 601, 659, 661, 827, 829, 1019, 1021, 1031, 1033, 1091, 1093, 1151, 1153, 1319, 1321, 1427, 1429, 1451, 1453, 1487, 1489, 1607, 1609 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..50.

EXAMPLE

a(3)=11=4*3-1, a(4)=13=4*3+1

MAPLE

i:=1:for k from 1 to 600 do if isprime(4*k-1) and isprime(4*k+1) then a[i]:=4*k-1:a[i+1]:=4*k+1: i:=i+2 fi od: seq(a[n], n=1..i-1);

CROSSREFS

Cf. A001097.

Sequence in context: A147568 A006794 A032457 * A162876 A162875 A166564

Adjacent sequences:  A122561 A122562 A122563 * A122565 A122566 A122567

KEYWORD

nonn

AUTHOR

Miklos Kristof, Sep 21 2006

STATUS

approved

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Last modified April 14 04:20 EDT 2021. Contains 342941 sequences. (Running on oeis4.)