A073923 - cp's OEIS frontend

A073923 a(1)=1, a(n) is the smallest power of 2 not included earlier such that Sum_{k=1..n} a(k) is prime.

n	a(n)
1	1
2	2
3	4
4	16
5	8
6	4096
7	32
8	16384
9	134217728
10	256
11	33554432
12	1073741824
13	2147483648
14	68719476736
15	8192
16	262144
17	2722258935367507707706996859454145691648
18	1152921504606846976
19	10889035741470030830827987437816582766592

[1, 2, 4, 16, 8, 4096, 32, 16384, 134217728, 256, 33554432, 1073741824, 2147483648, 68719476736, 8192, 262144, 2722258935367507707706996859454145691648, 1152921504606846976, 10889035741470030830827987437816582766592]

cp's OEIS Frontend

A073923 a(1)=1, a(n) is the smallest power of 2 not included earlier such that Sum_{k=1..n} a(k) is prime.

Table of values

List of values