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.

A381510 Smaller of two consecutive primes p and q, both ending with 7, such that q - p = 10n, or -1 if no such primes exist.

Table of values

n a(n)
1 337
2 887
3 4297
4 33247
5 31907
6 124367
7 218287
8 1122287
9 1964987
10 1313467
11 1468277
12 7160227
13 5518687
14 16525757
15 13626257
16 71880637
17 27915737
18 17051707
19 394059907
20 566348087
21 252314747
22 472865287
23 1289694257
24 633418787
25 1588640437
26 944192807
27 1391048047
28 7059848287

List of values

[337, 887, 4297, 33247, 31907, 124367, 218287, 1122287, 1964987, 1313467, 1468277, 7160227, 5518687, 16525757, 13626257, 71880637, 27915737, 17051707, 394059907, 566348087, 252314747, 472865287, 1289694257, 633418787, 1588640437, 944192807, 1391048047, 7059848287]