- 666, 4444, and 999999. All
repdigits are
palindromic numbers and are
multiples of repunits.
Other well-known
repdigits include the
repunit primes and...
- four-digit
numbers for
which Kaprekar's
routine does not
reach 6174 are
repdigits such as 1111,
which give the
result 0000
after a
single iteration. All...
-
Repdigits are a
generalization of repunits; they are
integers represented by
repeated instances of the same digit. For example, 333 is a
repdigit. The...
-
follows for three-digit numbers: Take any three-digit number,
other than
repdigits such as 111.
Leading zeros are allowed.
Arrange the
digits in descending...
-
whose all
permutations are
composites but they are not
multiples of 3,
repdigits or
numbers which only have
digits 0, 2, 4, 5, 6 and 8, even excluding...
- 6th
primary pseudoperfect number. 2,219,006,624 = 745 2,222,222,222 =
repdigit 2,276,423,485 =
number of ways to
partition {1,2,...,12} and then partition...
-
pandigital number in base 8. 2,178,309 =
Fibonacci number 2,222,222 =
repdigit 2,266,502 =
number of
signed trees with 13
nodes 2,274,205 = the number...
-
ending in 1, 3, 7 or 9 221,760 = 32nd
highly composite number 222,222 =
repdigit 224,737 = the 20,000th
prime number 227,475 =
Riordan number 234,256 =...
-
bases 3 (22223), 6 (2126), 9 (889), 15 (5515), 19 (4419) and 39 (2239). a
repdigit in
bases 3, 9, 15, 19 and 39. the sum of the
first 4 twin
prime pairs ((3...
-
colossally abundant number, 13th
superior highly composite number 22,222,222 =
repdigit 22,235,661 = 33×77 22,667,121 = 47612 = 694 24,010,000 = 49002 = 704 24...
