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A329102 Numbers k such that both k^2 + 3 and 2^k + 3 are primes. 1
2, 4, 28, 784 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Intersection of A057732 and A049422.
a(5) > 20000. - Tyler NeSmith, May 15 2021
a(5) > 2205444, using A057732. - Michael S. Branicky, Feb 16 2024
LINKS
Table of n, a(n) for n=1..4.
CROSSREFS
Cf. A000040, A057732, A049422, A329103.
Sequence in context: A102692 A292184 A248872 * A126580 A329063 A124687
Adjacent sequences: A329099 A329100 A329101 * A329103 A329104 A329105
KEYWORD
nonn,hard,more
AUTHOR
Alex Ratushnyak, Nov 04 2019
STATUS
approved

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Last modified May 23 17:39 EDT 2024. Contains 372765 sequences. (Running on oeis4.)