1525056

Appears in sequences

• Theta series of GH39, an extremal unimodular 39-dimensional lattice.at n=5A066234
• Numbers k with the property that it is possible to write the base 2 expansion of k as concat(a_2,b_2), with a_2>0 and b_2>0 such that, converting a_2 and b_2 to base 10 as a and b, we have a' * b' = k, where a' and b' are the arithmetic derivatives of a and b.at n=28A259675