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.
a(1) = floor(e^(1!)) = floor(e) = 2.
Table[Floor[E^n!], {n, 1, 7}]
default(realprecision, 100); vector(5, n, floor(exp(n!))) \\ Michel Marcus, Aug 06 2015
a(3) = 2^6 + 1 = 65.
[2^(Factorial(n)) + 1: n in [1..6]]; // Vincenzo Librandi, Aug 09 2015
Array[2^#! + 1 &, 6] (* Paolo Xausa, Jan 31 2024 *)
first(m)=vector(m,i,2^(i!)+1); /* Anders Hellström, Aug 08 2015 */
a(1) is obviously a first power. a(2) = 307841957589849138828884412917083740234375^2 is a square. a(3) = 5635779747116948576103515625^3 is a third power. a(4) = 716288998461106640625^4 is a fourth power. a(5) = 51072299355515625^5 is a fifth power.
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