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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.

A053098 When the Euler phi function is iterated with initial value primorial(n) = A002110(n), a(n)= first (maximum) power of 2 emerging during iteration.

Table of values

n a(n)
1 2
2 2
3 8
4 16
5 128
6 512
7 8192
8 16384
9 262144
10 2097152
11 16777216
12 67108864
13 2147483648
14 8589934592
15 274877906944
16 4398046511104
17 70368744177664
18 1125899906842624
19 18014398509481984
20 288230376151711744
21 2305843009213693952
22 18446744073709551616
23 1180591620717411303424

List of values

[2, 2, 8, 16, 128, 512, 8192, 16384, 262144, 2097152, 16777216, 67108864, 2147483648, 8589934592, 274877906944, 4398046511104, 70368744177664, 1125899906842624, 18014398509481984, 288230376151711744, 2305843009213693952, 18446744073709551616, 1180591620717411303424]

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

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