According to Pekka Janhunen, the stable isotopes that have 2^{n} neutrons.

- He4 Z=2, N=2
- Li7 Z=3, N=4
- N15 Z=7, N=8

O16 Z=8, N=8 - Si30 Z=14, N=16

P31 Z=15, N=16

S32 Z=16, N=16 - Fe58 Z=26, N=32

Co59 Z=27, N=32

Ni60 Z=28, N=32 - Pd110 Z=46, N=64

Cd112 Z=48, N=64

In113 Z=49, N=64

Sn114 Z=50, N=64