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A053584 a(n+1) is the smallest prime ending with a(n), where a(1)=7.

%I A053584 #14 Jun 23 2022 13:49:59
%S A053584 7,17,317,6317,26317,126317,2126317,72126317,372126317,5372126317,
%T A053584 125372126317,15125372126317,415125372126317,23415125372126317,
%U A053584 2223415125372126317,152223415125372126317,21152223415125372126317,4221152223415125372126317
%N A053584 a(n+1) is the smallest prime ending with a(n), where a(1)=7.
%H A053584 Michael S. Branicky, <a href="/A053584/b053584.txt">Table of n, a(n) for n = 1..372</a>
%o A053584 (Python)
%o A053584 from sympy import isprime
%o A053584 from itertools import count, islice
%o A053584 def agen(an=7):
%o A053584     while True:
%o A053584         yield an
%o A053584         pow10 = 10**len(str(an))
%o A053584         for t in count(pow10+an, step=pow10):
%o A053584             if isprime(t):
%o A053584                 an = t
%o A053584                 break
%o A053584 print(list(islice(agen(), 18))) # _Michael S. Branicky_, Jun 23 2022
%Y A053584 Cf. A000040, A053582, A053583, A069612.
%K A053584 base,nonn
%O A053584 1,1
%A A053584 _G. L. Honaker, Jr._, Jan 18 2000