This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A153224 #10 Jan 30 2022 15:59:56
%S A153224 26,32,41,86,2799,469113068
%N A153224 Numbers k such that the string k is found at position k-5 in the decimal digits of Pi.
%e A153224 a(1) = 26 because 26 occurs at offset (26-5) after the decimal in the digits of Pi.
%o A153224 (Python)
%o A153224 from sympy import S
%o A153224 # download https://stuff.mit.edu/afs/sipb/contrib/pi/pi-billion.txt, then
%o A153224 #with open('pi-billion.txt', 'r') as f: pi_digits = f.readline()
%o A153224 pi_digits = str(S.Pi.n(3*10**5+2))[:-2] # alternative to above
%o A153224 pi_digits = pi_digits.replace(".", "")
%o A153224 def afind():
%o A153224 for k in range(6, len(pi_digits)):
%o A153224 sk = str(k)
%o A153224 if sk == pi_digits[k-5:k-5+len(sk)]:
%o A153224 print(k, end=", ")
%o A153224 afind() # _Michael S. Branicky_, Jan 30 2022
%Y A153224 Cf. A057679, A057680, A109513, A109514, A153221, A153223.
%K A153224 base,more,nonn
%O A153224 1,1
%A A153224 _Gil Broussard_, Dec 21 2008
%E A153224 a(6) from _Michael S. Branicky_, Jan 30 2022