166716

Appears in sequences

• Triangle T(n,k), read by rows, given by (1,0,2,1,3,2,4,3,5,4,6,5,7,6,8,7,9,8,...) DELTA (0,1,0,1,0,1,0,1,0,1,0,1,0,1,...) where DELTA is the operator defined in A084938.at n=60A200545
• Numbers n such that 2n-1 and 2n+1 divide 2^n-1.at n=15A233089