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 A135620 #15 Jun 08 2025 19:57:38
%S A135620 1,2,8,32,512,2048,32768,131072,2097152,134217728,536870912,
%T A135620 34359738368,549755813888,2199023255552,35184372088832,
%U A135620 2251799813685248,144115188075855872,576460752303423488,36893488147419103232,590295810358705651712,2361183241434822606848,151115727451828646838272
%N A135620 a(n) = 2^(prime(n) - 2).
%H A135620 G. C. Greubel, <a href="/A135620/b135620.txt">Table of n, a(n) for n = 1..465</a>
%F A135620 a(n) = 2^(A000040(n)-2) = 2^(A040976(n)) = 2^A000040(n)/4 = A061286(n)/2.
%F A135620 a(n) = A034785(n)/4. - _Alois P. Heinz_, Jun 08 2025
%t A135620 Table[2^(Prime[n] - 2), {n,1,25}] (* _G. C. Greubel_, Oct 23 2016 *)
%o A135620 (Magma) [2^(NthPrime(n)-2): n in [1..25]]; // _Vincenzo Librandi_, Oct 23 2016
%o A135620 (PARI) a(n) = 2^(prime(n)-2); \\ _Michel Marcus_, Oct 23 2016
%Y A135620 Cf. A000040, A034785, A040976, A061286.
%Y A135620 Partial differences of A135482.
%K A135620 easy,nonn
%O A135620 1,2
%A A135620 _Omar E. Pol_, Mar 01 2008