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.

A215477 Semiprimes with consecutive (ascending) digits.

Table of values

n a(n)
1 4
2 6
3 9
4 34
5 123
6 789
7 901
8 1234
9 34567
10 56789
11 901234
12 1234567
13 7890123
14 567890123
15 12345678901
16 345678901234567
17 4567890123456789
18 12345678901234567
19 890123456789012345
20 3456789012345678901
21 456789012345678901234
22 123456789012345678901234567
23 1234567890123456789012345678901
24 23456789012345678901234567890123

List of values

[4, 6, 9, 34, 123, 789, 901, 1234, 34567, 56789, 901234, 1234567, 7890123, 567890123, 12345678901, 345678901234567, 4567890123456789, 12345678901234567, 890123456789012345, 3456789012345678901, 456789012345678901234, 123456789012345678901234567, 1234567890123456789012345678901, 23456789012345678901234567890123]

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

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