1, 3, 6, 10, 15, 21
The sum of the first six odd numbers is 36.
3
The sum of the first six positive numbers (1 to 6) is 21.
The sum of the first six counting numbers (1-6) is 19.
The first six prime numbers:- 2, 3, 5, 7, 11 and 13
The first six triangular numbers are : 1,3,6,10,15,21. However, sometimes the first triangular number is regarded as 0 (zero) so you then have 0,1,3,6,10,15 as the first six triangular numbers.
1,2,3,4,5,6
The first 26 prime numbers are :- 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97and 101
The sum of the first six prime numbers is 41 (2 + 3 + 5 + 7 + 11 + 13 = 41).
The first six counting numbers.
8,9,5,7,2 and 1
2,4,6,8,10,12