90525

Appears in sequences

• Triangular numbers with property that digits alternate in parity individually as well as in concatenation with previous terms.at n=24A068889
• Indices of prime numbers in A014260.at n=22A101762
• Triangular numbers t which are average of two consecutive primes p and p+4.at n=34A129752
• Triangular numbers n with digits d_1, d_2, ..., d_k such that d_1*(d_1+1)/2 + ... + d_k*(d_k+1)/2 is a triangular number.at n=47A254957
• Hexagonal numbers (A000384) in which parity of digits alternates.at n=21A297645
• Times on a 12-hour digital clock with 6 digits at which the three continuously moving hands of an analog clock, in the best approximation, enclose the same angles with one another, i.e., have the smallest sum of squares of the deviations from 120 degrees. When interpreting the terms as times of the day in the form hh:mm:ss, padding to the left with zeros is assumed.at n=16A347040