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 A123079 Twin primes of form 4k+1. 0
 5, 13, 17, 29, 41, 61, 73, 101, 109, 137, 149, 181, 193, 197, 229, 241, 269, 281, 313, 349, 421, 433, 461, 521, 569, 601, 617, 641, 661, 809, 821, 829, 857, 881, 1021, 1033, 1049, 1061, 1093, 1153, 1229, 1277, 1289, 1301, 1321, 1429, 1453, 1481, 1489, 1609 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS MAPLE a[1]:=5:i:=2:for k from 6 to 3000 do if isprime(k) and isprime(k+2) then b:=k:c:=k+2: if b mod 4 = 1 then a[i]:=b:i:=i+1 fi: if c mod 4 = 1 then a[i]:=c:i:=i+1 fi:fi od: seq(a[n], n=1..i-1); MATHEMATICA Select[Union[Flatten[Select[Partition[Prime[Range[300]], 2, 1], #[[2]]-#[[1]]==2&]]], Mod[ #, 4]==1&] (* Harvey P. Dale, Oct 16 2022 *) CROSSREFS Cf. A122564, A122565, A001097. Sequence in context: A283391 A145016 A354155 * A273950 A268511 A038938 Adjacent sequences: A123076 A123077 A123078 * A123080 A123081 A123082 KEYWORD nonn AUTHOR Miklos Kristof, Sep 27 2006 STATUS approved

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Last modified February 2 05:15 EST 2023. Contains 359997 sequences. (Running on oeis4.)