Two beta-decay stable nuclides exist for odd neutron numbers 1 (H and He), 3 (He and Li – the former having an extremely short half-life), 5 (Be and B), 7 (C and N), 55 (Mo and Ru), and 85 (Nd and Sm); the first four cases involve very light nuclides where odd-odd nuclides are more stable than their surrounding even-even isobars, and the last two surround the proton numbers 43 and 61 which have no beta-stable isotopes. Also, two beta-decay stable nuclides exist for odd proton numbers 1, 3, 5, 7, 17, 19, 29, 31, 35, 47, 51, 63, 77, 81, and 95; the first four cases involve very light nuclides where odd-odd nuclides are more stable than their surrounding even-even isobars, and the other numbers surround the neutron numbers 19, 21, 35, 39, 45, 61, 71, 89, 115, 123, 147 which have no beta-stable isotopes. (For N = 21 the long-lived primordial K exists, and for N = 71 there is Te whose electron capture has not yet been observed, but neither are beta-stable.)