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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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
The sequence is conjectured to be finite and full in A046927. The conjecture holds through 10^9.
LINKS
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
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.)