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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.

A335667 a(n) is the smallest even number k such that k-1 and k+1 are both n-almost primes.

Table of values

n a(n)
1 4
2 34
3 274
4 2276
5 8126
6 184876
7 446876
8 18671876
9 95234374
10 1144976876
11 6018359374
12 281025390626
13 2068291015624
14 6254345703124
15 181171630859374
16 337813720703126
17 31079046044921876
18 205337027587890626

List of values

[4, 34, 274, 2276, 8126, 184876, 446876, 18671876, 95234374, 1144976876, 6018359374, 281025390626, 2068291015624, 6254345703124, 181171630859374, 337813720703126, 31079046044921876, 205337027587890626]

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

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