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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.

A294907 a(n) is the smallest number k such that exactly half of the prime(n+1)-rough numbers in the interval [prime(n)^2 + 1, k] are prime.

Table of values

n a(n)
1 87
2 925
3 4757
4 17699
5 43357
6 97703
7 187813
8 350321
9 595871
10 920081
11 1405609
12 2024047
13 2827861
14 3931217
15 5348053
16 7053941
17 9058607
18 11637667
19 14631209
20 18251339
21 22657429
22 27786589
23 33829567
24 40651799
25 48209237
26 56928409
27 67107197
28 78713287
29 92233283
30 107643667

List of values

[87, 925, 4757, 17699, 43357, 97703, 187813, 350321, 595871, 920081, 1405609, 2024047, 2827861, 3931217, 5348053, 7053941, 9058607, 11637667, 14631209, 18251339, 22657429, 27786589, 33829567, 40651799, 48209237, 56928409, 67107197, 78713287, 92233283, 107643667]

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

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