Romer Castillo

7 Questions 74 Answers 0 Followers

Questions related from Romer Castillo

Do you have survey questionnaire on the employer's feedback on the job performance of college graduates?

Please share with us your questionnaire on employer's feedback on the job performance of college graduates, particularly graduates of business administration, customs administration, public...

02 April 2017 3,514 3 View

Can you prove or disprove the following: 2 and 12 are the only factoriangular numbers that are twice a triangular number?

In the papers given in the links below, we define factoriangular number (Ftn) as the sum of corresponding factorial and triangular number, that is, Ftn = n! + Tn where Tn = n(n+1)/2. Notice that...

23 February 2016 6,639 11 View

Can you derive a closed form of the ordinary generating function for the sequence of factoriangular numbers {2, 5, 12, 34, 135, 741, 5068, ...}?

Factoriangular numbers (denoted by Ftn) are formed by adding corresponding factorials and triangular numbers, that is Ftn = n! + Tn, where Tn is the nth triangular number. The closed form of the...

16 February 2016 1,167 3 View

Is there any previous study that shows: n! = T((n-1)!+n) - T((n-1)!) - T(n) where T(k) is the kth triangular number?

There are many relationships or connections between factorials and triangular numbers that can be found in the literature, both old and new. In a recent study on factoriangular numbers (sums of...

11 February 2016 3,300 5 View

Aside from 2, 5 and 34, is there any other factoriangular number (sum of corresponding factorial & triangular number) that is also a Fibonacci number?

If corresponding factorials and triangular numbers are added, the results form the sequence of numbers, {2, 5, 12, 34, 135, 741, 5068, 40356, ...}, which I call factoriangular numbers. In the list...

04 February 2016 1,003 8 View

Who is Slovin and where and how did the Slovin's Formula for determining the sample size for a survey research originated?

The Slovin's Formula is quite popularly use in my country for determining the sample size for a survey research, especially in undergraduate thesis in education and social sciences, may be because...

26 January 2016 966 33 View

Aside from 741, is there any other number that is both factoriangular (sum of corresponding factorial and triangular number) and triangular?

Let factorials be added to their corresponding triangular numbers resulting to a sequence of numbers {2, 5, 12, 34, 135, 741, ...}, which I call factoriangular numbers in my recent papers. Let...

20 January 2016 626 4 View