Aesthetic Numbers
Aesthetic numbers are banknotes with numbers that look nice. Because these numbers are easy to remember and feel balanced or smooth, people are willing to pay more for them. Although looks may be subjective, it’s evident that enough collectors value such notes, given the elevated prices they command.
Rotator Numbers
Rotator numbers are numbers that still read the same even when you rotate them 180°. In mathematical jargon, they are known as “strobogrammatic numbers”. The digits that rotate into the same number are 0, 1 and 8, while 6 and 9 rotate into each other. Numbers with these digits, if sequenced correctly, form rotator numbers. For example, 016910 is a rotator because when rotated, the numbers still form 016910.
S10 189681
Ungraded, brand new
Market Price: $30
(2024)
P50 169691
Ungraded, brand new
Market Price: $70
(2024)
P100 160091
Ungraded, brand new
Market Price: $120
(2024)
Repeater Numbers
Repeater numbers feature the same digits appearing again and again. For example, 156156 or 121212 both have numbers that repeat in an identical pattern: 156156 is a three-digit repeater, and 121212 is a two-digit repeater. Statistically, two-digit repeaters are 10 times rarer than three-digit repeaters.
B5 2-digit repeater
Ungraded, well used
Market Price: $40
(2024)
S2 3-digit repeater
Ungraded, like new
Lucky number
Market Price: $26
(2024)
S100 3-digit repeater
Ungraded, like new
Lucky number
Market Price: $250
(2024)
P2 3-digit repeater
Ungraded, heavily used
Market Price: $3
(2024)
Radar Numbers
Radar numbers are the layman’s equivalent way of referring to palindromes—they read the same forwards and backwards, like a mirror image. For example, 623326 is a radar because it looks the same from left to right and right to left.
B20 Radar 205-502
Ungraded, brand new
Market Price: $60
(2024)
S5 Radar 887-788
Ungraded, brand new
Lucky number, triple pairs
Market Price: $65
(2024)
Triple Pairs
Triple pairs contain three pairs of two identical digits appear one after another. For example, 118855 is a triple pair because it groups into 11, 88, and 55 in order.
O1 Triple pairs
Ungraded, well used
Market Price: $30
(2024)
S10 Triple pairs
Ungraded, brand new
Lucky number
Market Price: $40
(2024)
P5 Triple pairs
Ungraded, heavily used
Lucky number, first prefix variant
Market Price: $15
(2024)
Binary Numbers
Binary numbers contain only the digits 1 and 0. The name comes from computer binary, which also uses just these two digits. The higher demand for these numbers is a relatively recent evolution, almost certainly as a result of the computer age.
S2 Binary number
Ungraded, well used
Market Price: $22
(2024)
S10 Binary number
Ungraded, well used
Market Price: $42
(2024)
P2 Binary number
Ungraded, brand new
Market Price: $22
(2024)