230128

Appears in sequences

• Concatenation of first 3 digits and last 3 digits of n-th perfect number.at n=7A138877
• Number of n-step two-sided prudent self-avoiding walks ending at the northwest corner of their box.at n=15A191653
• Number of nX5 0..1 arrays with no element equal to a strict majority of its horizontal and antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.at n=6A279706
• Number of 7Xn 0..1 arrays with no element equal to a strict majority of its horizontal and antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.at n=4A279714