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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.

A069614 a(1) = 2; a(2n) = smallest prime starting (the most significant digits) with a(2n-1) (i.e., as a right concatenation of a(2n-1) and a number with no insignificant zeros); 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 2
2 23
3 223
4 2237
5 32237
6 3223729
7 63223729
8 632237297
9 2632237297
10 263223729721
11 12263223729721
12 1226322372972173
13 171226322372972173
14 17122632237297217381
15 2117122632237297217381
16 21171226322372972173813

List of values

[2, 23, 223, 2237, 32237, 3223729, 63223729, 632237297, 2632237297, 263223729721, 12263223729721, 1226322372972173, 171226322372972173, 17122632237297217381, 2117122632237297217381, 21171226322372972173813]

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

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