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Primes of the form 80*R_nk + 3, where R_nk is the repunit (A002275) of length nk.
Primes of the form (8*10^nk - 53)/9. - Vincenzo Librandi, Nov 16 2010
Cf. A002275, A056694 (corresponding nk), A099422.
Makoto Kamada, <a href="httphttps://stdkmd.comnet/nrr/8/88883.htm#prime">Prime numbers of the form 88...883</a>.
OEIS Server: https://oeis.org/edit/global/2791
Primes of the form (8*10^n- - 53)/9 [From . - _Vincenzo Librandi, _, Nov 16 2010]
Cf. A002275, A056694 (corresponding n).), A099422.