cp's OEIS Frontend

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.

A356557 Start with a(1)=2; to get a(n+1) insert in a(n) at the rightmost possible position the smallest possible digit such that the new number is a prime.

Table of values

n a(n)
1 2
2 23
3 233
4 2333
5 23333
6 233323
7 2333231
8 23332301
9 233323001
10 2333230019
11 23332030019
12 233320360019
13 2333203600159
14 23332036001959
15 233320360019569
16 2333203600195669
17 23332036001956469
18 233320360019564269
19 2333203600195642469
20 23332036001956424629
21 233320360019564246269

List of values

[2, 23, 233, 2333, 23333, 233323, 2333231, 23332301, 233323001, 2333230019, 23332030019, 233320360019, 2333203600159, 23332036001959, 233320360019569, 2333203600195669, 23332036001956469, 233320360019564269, 2333203600195642469, 23332036001956424629, 233320360019564246269]

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

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