Published April 11, 2019 | Version v1
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Triangular-Type Selfie Numbers: Digit's Order

  • 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 digit's order. The author's previous work is up to 4-digits numbers. This work extends to 5-digits numbers. The work on reverse order is given in a separate paper.

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