- A
strobogrammatic number is a
number whose numeral is
rotationally symmetric, so that it
appears the same when
rotated 180 degrees. In
other words, the...
- eighty-eight) is the
natural number following 887 and
preceding 889. It is a
strobogrammatic number that
reads the same right-side up and upside-down on a seven-segment...
-
number following 221 and
preceding 223. It is a
decimal repdigit and a
strobogrammatic number (meaning that it
looks the same
turned upside down on a calculator...
-
points of a 3
times 4 grid of
squares 609 = 3 × 7 × 29,
sphenic number,
strobogrammatic number 610 = 2 × 5 × 61,
sphenic number,
Fibonacci number,
Markov number...
- with a
Zeckendorf representation requiring 5
Fibonacci numbers. a
strobogrammatic number. the
largest number in
English not
containing the
letter 'n'...
- and the sum of
digits of its
prime factors are equal. It is also a
strobogrammatic number,
meaning that when
shown on a seven-segment display, turning...
- 807 = 3 × 269, antisigma(42) 808 = 23 × 101,
refactorable number,
strobogrammatic number 809 =
prime number,
Sophie Germain prime, Chen prime, Eisenstein...
- 119) (sequence A002384 in the OEIS). In base 10, it is
furthermore a
strobogrammatic number, as well as a
Harshad number. In base 18, the
number 111 is...
-
before overlay plans added two more area codes. 906 = 2 × 3 × 151,
strobogrammatic,
sphenic number,
Mertens function(906)
returns 0 907 =
prime number...
- down
images are not
valid digits either. (Much as the case is with
strobogrammatic numbers,
whether a number,
whether prime,
composite or otherwise, is...
