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A359630
Primes p such that 10^p+3 or 10^p+9 is also prime.
0
2, 3, 5, 11, 17, 101, 107, 26927, 48109
OFFSET
1,1
COMMENTS
Union of the terms which are prime in A049054 and in A088275.
If it exists, a(10) > 2*10^5 (according to the comment at A088275).
EXAMPLE
3 is a term since it is prime and so is 10^3 + 9 = 1009.
11 is a term since it is prime and 10^11 + 3 = 100000000003 is also a prime.
MATHEMATICA
Block[{p}, ParallelDo[p := Prime @ i; If[(PrimeQ[10^p + 3] || PrimeQ[10^p + 9]), Print @ p], {i, PrimePi @ 48109}, Method -> "FinestGrained"]]
CROSSREFS
Sequence in context: A178606 A097048 A286268 * A244914 A227126 A057652
KEYWORD
nonn,base,hard,more
AUTHOR
Mikk Heidemaa, Jan 08 2023
STATUS
approved