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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.

A292687 a(n) = Product_{k=0..n-1} (4^(3^k) + 1) = decimal value of the Sierpinski-type iteration result A292686(n) (replace 0 with 000 and 1 with 101) considered as a binary number.

Table of values

n a(n)
0 1
1 5
2 325
3 85197125
4 1534774961612150361293125
5 8972304477322525702813810177861539421333393918862058319149818714344653125

List of values

[1, 5, 325, 85197125, 1534774961612150361293125, 8972304477322525702813810177861539421333393918862058319149818714344653125]

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

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