Published April 14, 2019 | Version v1
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Triangular-Type Selfie Numbers: Reverse Order of Digits

  • 1. Formarly, Professor of Mathematics, Federal University of Santa Catarina, Florianópolis, SC, Brazil

Description

Numbers represented by their own digits by certain operations are considered as selfie numbers. Some times they are called as wild narcissistic numbers. There are many ways of representing selfie numbers. They can be represented in digit's order, reverse order of digits, increasing and/or decreasing order of digits, etc. These can be obtained by use of  basis operations along with factorial, square-root, Fibonacci sequence, Triangular numbers, binomial coefficients, S-gonal values, centered polygonal numbers, quadratic numbers, cubic numbers, etc. This paper brings selfie numbers with triangular numbers in reverse order of digits. The previous work of author is up to 4-digits numbers. This work extends to 5-digits numbers. The work on digit's order in 5-digits numbers can be seen in [32].

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