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Rediscovered this intriguingly spare OEIS entry: https://oeis.org/A033875
You'll never guess what the 22nd term is!
@christianp Well on my little laptop with the default isPrime library it hangs trying to find a(22) but.. with a Miller Rabin primality test I can get a(22) and a(23)!
But I am stuck for a(24) now..
@christianp Is this sequence infinite ? 😂