
COMMENTS

Currently a(n) is unknown for n = {11, 15, 18, 20, 28, 44, 46, 49, 51, 52, 53, 55, 57, 58, 61, 62, 64, 71, 73, 77, 81, 83, 91, 92, 94, ...}. All n < 100 and 1 < k < 2^10 have been checked.
All nonzero a(n) have a form n^(2^m) + (n+1)^(2^m).
The exponents m are listed in A080121. The first occurrence of each exponent m in A080121 is listed in A122902.
