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.

A069616 a(1) = 4; 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 4
2 41
3 241
4 2411
5 32411
6 324113
7 6324113
8 63241133
9 1563241133
10 15632411339
11 815632411339
12 81563241133919
13 281563241133919
14 2815632411339191
15 322815632411339191
16 32281563241133919151
17 432281563241133919151

List of values

[4, 41, 241, 2411, 32411, 324113, 6324113, 63241133, 1563241133, 15632411339, 815632411339, 81563241133919, 281563241133919, 2815632411339191, 322815632411339191, 32281563241133919151, 432281563241133919151]

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

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