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.

A198586 a(n) = (4^A001651(n+1) - 1)/3: numbers (4^k-1)/3 for k > 1, not multiples of 3.

Table of values

n a(n)
1 5
2 85
3 341
4 5461
5 21845
6 349525
7 1398101
8 22369621
9 89478485
10 1431655765
11 5726623061
12 91625968981
13 366503875925
14 5864062014805
15 23456248059221
16 375299968947541
17 1501199875790165
18 24019198012642645
19 96076792050570581
20 1537228672809129301

List of values

[5, 85, 341, 5461, 21845, 349525, 1398101, 22369621, 89478485, 1431655765, 5726623061, 91625968981, 366503875925, 5864062014805, 23456248059221, 375299968947541, 1501199875790165, 24019198012642645, 96076792050570581, 1537228672809129301]

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

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