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 A031216 #19 Sep 01 2024 18:31:44 %S A031216 2,3,5,7,12,14,18,20,25,31,34,40,45,47,51,58,64,67,73,78,80,86,91,97, %T A031216 106,122,124,128,130,135,150,155,161,163,174,177,183,190,194,201,207, %U A031216 210,221,223,227,229,254,267,271,273,278,284,287,298,304,311 %N A031216 Write primes in base 10 but interpret as if in base 11. %H A031216 Alois P. Heinz, <a href="/A031216/b031216.txt">Table of n, a(n) for n = 1..10000</a> %F A031216 a(n) = A171397(prime(n)). - _Michel Marcus_, Aug 31 2024 %e A031216 13_10 = 11+2 -> 12_11, so 5th term is 12. %p A031216 a:= n-> (l-> add(l[i]*11^(i-1), i=1..nops(l)))(convert(ithprime(n),base,10)): %p A031216 seq(a(n), n=1..56); # _Alois P. Heinz_, Aug 30 2024 %o A031216 (Python) %o A031216 from sympy import prime %o A031216 def A031216(n): return int(str(prime(n)),11) # _Chai Wah Wu_, Aug 30 2024 %o A031216 (PARI) a(n) = fromdigits(digits(prime(n)), 11); \\ _Michel Marcus_, Aug 31 2024 %Y A031216 Cf. A000040, A171397. %K A031216 nonn,base %O A031216 1,1 %A A031216 _Jeff Burch_ %E A031216 a(25) corrected by _Sean A. Irvine_, Apr 16 2020