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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.

A270338 Primes whose decimal expansion contains only 3's and 4's, in which every 4 is preceded and followed by a 3.

Table of values

n a(n)
1 3343
2 3433
3 33343
4 333433
5 334333
6 343333
7 343433
8 3333433
9 3343343
10 3343433
11 3433333
12 34333333
13 333334333
14 333343343
15 333343433
16 333433343
17 333434333
18 334334333
19 3333334343
20 3333433343
21 3334333333
22 3343334333
23 3343434343
24 3433434343
25 3434343433
26 33333333343

List of values

[3343, 3433, 33343, 333433, 334333, 343333, 343433, 3333433, 3343343, 3343433, 3433333, 34333333, 333334333, 333343343, 333343433, 333433343, 333434333, 334334333, 3333334343, 3333433343, 3334333333, 3343334333, 3343434343, 3433434343, 3434343433, 33333333343]

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

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