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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.

A381511 Smaller of two consecutive primes p and q, both ending with 9, such that q - p = 10*n, or -1 if no such primes exist.

Table of values

n a(n)
1 139
2 3089
3 5749
4 20809
5 60539
6 110359
7 173359
8 618719
9 1294849
10 838249
11 6877109
12 1895359
13 11188759
14 7621259
15 35560009
16 33803689
17 124956059
18 92801029
19 142414669
20 378043979
21 229316459
22 390932389
23 1095750599
24 995151679
25 2174082649
26 2603726969
27 3402493709
28 1997191249

List of values

[139, 3089, 5749, 20809, 60539, 110359, 173359, 618719, 1294849, 838249, 6877109, 1895359, 11188759, 7621259, 35560009, 33803689, 124956059, 92801029, 142414669, 378043979, 229316459, 390932389, 1095750599, 995151679, 2174082649, 2603726969, 3402493709, 1997191249]

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

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