17-12n 17-12(10)=-103
The first number in the sequence 19, 23, 29, 31 is 19. This sequence lists prime numbers, and 19 is the smallest among them.
31
The next number in the sequence 5-7-13-31 is 69.
The number halfway between 7 and 31 is 19.
49
31
39
The next number in the sequence 5-7-13-31 is 69.
Oh, dude, the tenth perfect number is 8,589,869,056. It's like a perfect number, but, you know, the tenth one. So, if you're ever in a situation where you need to know the tenth perfect number, now you're prepared. You're welcome.
a
The next number is 46. The sequence adds an increasing multiple of 3. 1+3 = 4, 4+6=10, 10+9=19, 19+12=31, and 31+15 = 46. With 1 as the value for n=1, the value for the nth term is x = 1.5 n² - 1.5n + 1 e.g. the 6th term is 1.5 (6x6) - 1.5 (6) + 1 = 54 - 9 + 1 = 46
The number halfway between 7 and 31 is 19.
31
49
61
192
yes it is