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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.

A118908 a(1) = 4; a(n) is greatest semiprime < a(n-1)^2.

Table of values

n a(n)
1 4
2 15
3 221
4 48839
5 2385247913
6 5689407606470855563
7 32369358912568429679140929317208046943
8 1047775396410673232345014594095988998399127191704501568910205139392491645247

List of values

[4, 15, 221, 48839, 2385247913, 5689407606470855563, 32369358912568429679140929317208046943, 1047775396410673232345014594095988998399127191704501568910205139392491645247]

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

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