A362861 Positive integers n such that 2*n cannot be written as a sum of distinct elements of the set {5^a + 5^b: a,b = 0,1,2,...}.
2, 7, 10, 11, 12, 27, 35, 50, 51, 52, 55, 60, 135, 255
Offset: 1
Examples
a(1) = 2, since 2*1 = 5^0 + 5^0 but 2*2 cannot be written as a sum of distinct numbers of the form 5^a + 5^b (a,b >= 0).
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