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A007640 2n^2 - 2n+19 is composite.
(Formerly M5068)
0
19, 20, 22, 25, 29, 34, 38, 39, 40, 45, 47, 48, 55, 56, 57, 58, 60, 61, 63, 64, 65, 68, 71, 74, 76, 77, 78, 82, 83, 85, 90, 91, 93, 94, 95, 96, 97, 102, 104, 107, 110, 112, 113, 114, 115, 117, 119, 122, 123, 124, 126, 127, 129, 130, 131, 133, 134, 135, 137, 139 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

CROSSREFS

Sequence in context: A004508 A018824 A093680 * A054304 A151979 A022109

Adjacent sequences:  A007637 A007638 A007639 * A007641 A007642 A007643

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein, Robert G. Wilson v (rgwv(AT)rgwv.com)

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Last modified February 17 19:13 EST 2012. Contains 206085 sequences.