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A145688 Primitive prime factors of the sequence 2k^2 + 1 in the order that they are found. 0
3, 19, 11, 17, 73, 43, 163, 67, 113, 131, 41, 193, 59, 241, 89, 883, 353, 1153, 139, 1459, 523, 1801, 641, 683, 2179, 257, 2593, 83, 107, 179, 97, 3529, 137, 1291, 4051, 491, 419, 1601, 1667, 601, 1873, 307, 2017, 2243, 211, 379, 827, 233, 467, 2731, 313, 8713 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
a(n) mod 8 = 1 or 3.
LINKS
CROSSREFS
Cf. A144851.
Sequence in context: A179767 A244605 A213602 * A358979 A178985 A357435
KEYWORD
nonn
AUTHOR
Bernhard Helmes (pi(AT)devalco.de), Oct 16 2008
STATUS
approved

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Last modified June 15 18:41 EDT 2024. Contains 373410 sequences. (Running on oeis4.)