98989

Appears in sequences

• Numbers k such that k and k^2 use only the digits 1, 2, 7, 8 and 9.at n=18A137018
• Positive numbers k such that -k, -(k + 1), -(k + 2), and -(k + 3) are 4 consecutive negative negabinary-Niven numbers (A331728).at n=30A331825
• Number of quadrilateral regions in a "frame" of size n X n (see Comments in A331776 for definition), divided by 8.at n=38A332596
• a(n) is n in binary rendered as a base-10 number minus n in ternary rendered as a base-10 number.at n=33A347111
• a(n) is n in binary rendered as a base-10 number minus n in ternary rendered as a base-10 number.at n=34A347111