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A337924
Odd numbers, x, such that for all primes (p,q) such that x = p + 2q, x + 2p and x + 2q are composite.
0
1, 3, 5, 59, 151
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OFFSET
1,2
COMMENTS
The sequence is conjectured to be finite and full in
A046927
. The conjecture holds through 10^9.
LINKS
Table of n, a(n) for n=1..5.
EXAMPLE
For 59, (p,q) can be (13,23), (37,11), and (53,3). 59 + 2 * 13, 59 + 2 * 23, ... 59 + 2 * 3 are all composite, so 59 is in the sequence.
CROSSREFS
Cf.
A046927
.
Sequence in context:
A248923
A155121
A106914
*
A049190
A174920
A158314
Adjacent sequences:
A337921
A337922
A337923
*
A337925
A337926
A337927
KEYWORD
nonn
,
more
AUTHOR
Jud McCranie
, Oct 09 2020
STATUS
approved
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Last modified April 24 04:14 EDT 2024. Contains 371918 sequences. (Running on oeis4.)