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a(n) >> n^2 log n by Brun's sieve. - Charles R Greathouse IV, Oct 10 2023
(PARI) list(lim)=my(v=List(), p); forstep(n=5, sqrtint(4*lim+5), 2, if(isprime(p=(n^2-5)/4), listput(v, p))); Vec(v) \\ Charles R Greathouse IV, Oct 10 2023
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For a(n)>29, the fractional part of square root of a(n) starts with digit 4 (see A034100). - Charles Kusniec, Sep 06 2022
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(MAGMAMagma) [ a: n in [0..150] | IsPrime(a) where a is n^2 - n - 1 ]; // Vincenzo Librandi, Aug 01 2011
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