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a(n) is the exponent of 2 in x = 2^m*5^n, where x = b(n)-b(n-1) and b(n) and b(n-1) are consecutive terms in A050649.
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%I #3 Mar 31 2012 14:11:24

%S 1,2,4,17,62

%N a(n) is the exponent of 2 in x = 2^m*5^n, where x = b(n)-b(n-1) and b(n) and b(n-1) are consecutive terms in A050649.

%e a(3) = 2: b(3)-b(2) = 2512-12 = 2500; 2500 = 2^2*5^4, hence a(3)=2.

%Y Cf. A050649.

%K nonn

%O 2,2

%A _Ray G. Opao_, Jul 23 2004