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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.

A069618 a(1) = 6; 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 6
2 61
3 461
4 46133
5 246133
6 2461337
7 22461337
8 224613371
9 12224613371
10 1222461337117
11 151222461337117
12 15122246133711733
13 615122246133711733
14 615122246133711733213
15 9615122246133711733213
16 961512224613371173321349

List of values

[6, 61, 461, 46133, 246133, 2461337, 22461337, 224613371, 12224613371, 1222461337117, 151222461337117, 15122246133711733, 615122246133711733, 615122246133711733213, 9615122246133711733213, 961512224613371173321349]

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

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