Strobogrammatic number Strobogrammatic number 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 numeral looks the same right-side up and upside down (e.g., 69, 96, 1001). A strobogrammatic prime is a strobogrammatic number that is also a prime number, i.e., a number that is only divisible by one and itself (e.g., 11). It is a type of ambigram, words and numbers that retain their meaning when viewed from a different perspective, such as palindromes. When written using standard characters (ASCII), the numbers, 0, 1, 8 are
The Infinity Concerto The Infinity Concerto The Infinity Concerto () is a 1984 fantasy novel written by Greg Bear. The plot centers around teenager Michael Perrin's search for what is a "Song of Power" and why some think he can create such a thing. Transported to another realm, he discovers beings known as "the "Sidhe" intervened in Coleridge's incomplete poem, "Kubla Khan". They have stopped others from creating "Songs of Power" and now they are looking at him. "The Infinity Concerto" was followed in 1986 by "The Serpent Mage". In 1939, a composer named Arno Waltiri premiered his latest work, Concerto Opus 45: