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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.

A118909 a(1) = 4; a(n) is least semiprime > a(n-1)^2.

Table of values

n a(n)
1 4
2 21
3 445
4 198026
5 39214296677
6 1537761063871773242347
7 2364709089560047865452947255794201194068433
8 5591849078247910476736920566826713466552016538943524658263883555662554776622687075541

List of values

[4, 21, 445, 198026, 39214296677, 1537761063871773242347, 2364709089560047865452947255794201194068433, 5591849078247910476736920566826713466552016538943524658263883555662554776622687075541]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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