290703

Appears in sequences

• Triangular numbers with property that digits alternate in parity individually as well as in concatenation with previous terms.at n=31A068889
• a(0)=1, a(n+1) = a(0) + a(1)*a(2) + a(3)*a(4)*a(5) + a(6)*a(7)*a(8)*a(9) + ... + ...*a(n).at n=8A227367
• Sequence of distinct least positive triangular numbers such that the arithmetic mean of the first n terms is also a triangular number. Initial term is 1.at n=17A236416