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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.

A069617 a(1) = 5; a(2n) = smallest prime that is a right concatenation of a(2n-1) and a number with no insignificant zeros and a(2n+1) = smallest prime ending in ( the least significant digits) a(2n-1). Alternate left and right concatenation yielding primes.

Table of values

n a(n)
1 5
2 53
3 353
4 3533
5 33533
6 3353321
7 113353321
8 1133533213
9 101133533213
10 10113353321311
11 310113353321311
12 3101133533213117
13 143101133533213117
14 14310113353321311739
15 314310113353321311739
16 314310113353321311739103

List of values

[5, 53, 353, 3533, 33533, 3353321, 113353321, 1133533213, 101133533213, 10113353321311, 310113353321311, 3101133533213117, 143101133533213117, 14310113353321311739, 314310113353321311739, 314310113353321311739103]

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

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