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A055390
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Terms of A007634 where n-40 is not a perfect square.
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3
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81, 82, 84, 87, 91, 96, 102, 109, 117, 122, 123, 126, 127, 130, 136, 138, 143, 147, 155, 159, 162, 163, 164, 170, 172, 173, 178, 185, 186, 187, 190, 201, 204, 205, 207, 208, 213, 215, 216, 217, 218, 232, 234, 237, 239, 242, 244, 245, 246, 248, 249, 251, 252
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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MAPLE
| A007634 := {}:
for n from 0 to 1000 do
k := n^2+n+41:
if isprime(k) = false then A007634 := union(A007634, {n}) end if:
end do:
pv1 := Vector(1000, j -> (j-1)^2+40):
p1 := convert(pv1, set):
A055390 := minus(A007634, p1); - Matt Anderson, Sep 26 2011
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CROSSREFS
| Cf. A007634 (numbers where n^2 + n + 41 is composite). A194634 (numbers in A007634 that are not in 3 parabolas). - Matt Anderson, Sep 26 2011
Sequence in context: A090292 A177842 A075691 * A186472 A183984 A089784
Adjacent sequences: A055387 A055388 A055389 * A055391 A055392 A055393
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KEYWORD
| nonn
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AUTHOR
| J. Lowell (jhbubby(AT)avana.net), Oct 08 2000
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EXTENSIONS
| More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Mar 19 2002.
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