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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.

A069620 a(1) = 8; 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 8
2 83
3 283
4 2833
5 32833
6 328331
7 2328331
8 232833127
9 3232833127
10 323283312749
11 14323283312749
12 1432328331274927
13 281432328331274927
14 28143232833127492741
15 3628143232833127492741
16 36281432328331274927411

List of values

[8, 83, 283, 2833, 32833, 328331, 2328331, 232833127, 3232833127, 323283312749, 14323283312749, 1432328331274927, 281432328331274927, 28143232833127492741, 3628143232833127492741, 36281432328331274927411]

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

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