
Er navnet mitt et palindromprimtall?
Jeg har tidligere skrevet om snodige tallfenomener som Snøballtall, Kvadratrotord, Kvadratrotord en gang til, Selvtall og Selvprimtall og om et navn kan være et primtall. “If you see someone’s name and you give each letter a value from 1 to 26 (a = 1, b = 2 etc.) and you add the numbers up in […]

Self numbers and self primes
In 1949 the Indian mathematician D.R. Kaprekar discovered a class of numbers called selfnumbers. A number N is said to be a self number if it cannot be written as m + the sum of digits of m for any m. To find out if a given number is a self number, the idea is […]

If my name was a number, is it perhaps a prime number?
My wife is reading a book at the moment: “The Curious Incident of the Dog in the NightTime by Mark Haddon“ Sitting in our sofa, she read out aloud for me from one of the pages, something she knew I would enjoy: “If you see someone’s name and you give each letter a value from […]