Poffa: Intressant, dessutom ett tröjnummer som ingen MoDoit tidigare burit.
Här får man smidigt med 17 också i beräkningen...
"It is also a Fibonacci number (the largest Fibonacci number to also be a triangular number) and a Kaprekar number. The number 55, like 89, displays an interesting property of the Fibonacci Sequence.
55 is a semiprime, being the product of 5 and 11 and it is the 2nd member of the (5.q) semiprime family. 55 is one of only two integers with an aliquot sum of 17 (the other being 39)."
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Här får man smidigt med 17 också i beräkningen...
"It is also a Fibonacci number (the largest Fibonacci number to also be a triangular number) and a Kaprekar number. The number 55, like 89, displays an interesting property of the Fibonacci Sequence.
55 is a semiprime, being the product of 5 and 11 and it is the 2nd member of the (5.q) semiprime family. 55 is one of only two integers with an aliquot sum of 17 (the other being 39)."