[seqfan] Possible error in A190660
Jeremy Gardiner
jeremy.gardiner at btinternet.com
Sat Aug 10 16:12:40 CEST 2013
A190660 Number of triangular numbers T(k) between powers of 2, 2^(n-1) <
T(k) <= 2^n
1, 0, 1, 1, 2, 2, 3, 5, 7, 9, 13, 19, 27, 37, 53, 75, 106, 150, ...
I calculate:
1, 0, 1, 1, 1, 2, 2, 3, 5, 7, 9, 13, 19, 27, 37, 53, 75, 106, 150, ...
Being first differences of A(n) = round(sqrt(2)^n), n = 0,1,...
A(n) = 1, 1, 2, 3, 4, 6, 8, 11, 16, 23, 32, 45, 64, 91, 128, 181
Cf. A057048
- Please can someone verify?
Thanks,
Jeremy
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