1283040

Appears in sequences

• Numbers k such that core(k) = b(k,1)*b(k,0) where b(k,1) is the number of 1's in binary representation of k, b(k,0) the number of 0's and core(k) the squarefree part of k.at n=28A071639
• a(n) = 3*a(n-1) + 3*a(n-2), n>2, a(0)=1, a(1)=2, a(2)=8.at n=11A155116
• "Erase or triple": list of the successive "altitude" records (see the comments section).at n=4A300151