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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.

A215199 Smallest number k such that k and k+1 are both of the form p*q^n where p and q are distinct primes.

Table of values

n a(n)
1 14
2 44
3 135
4 2511
5 8991
6 29888
7 916352
8 12393728
9 155161088
10 2200933376
11 6856828928
12 689278976
13 481758175232
14 3684603215871
15 35419114668032
16 2035980763136
17 174123685117952
18 9399153082499072
19 19047348965998592
20 203368956137832447
21 24217192574746623
22 2503092614937444351

List of values

[14, 44, 135, 2511, 8991, 29888, 916352, 12393728, 155161088, 2200933376, 6856828928, 689278976, 481758175232, 3684603215871, 35419114668032, 2035980763136, 174123685117952, 9399153082499072, 19047348965998592, 203368956137832447, 24217192574746623, 2503092614937444351]

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

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