login
A329102
Numbers k such that both k^2 + 3 and 2^k + 3 are primes.
1
2, 4, 28, 784
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
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Alex Ratushnyak, Nov 04 2019
STATUS
approved