First 40 Prime Numbers

The first 40 prime numbers. Primes are divisible only by 1 and themselves — they are the building blocks of all integers.

2 is the only even prime — every other even number divides by 2. The widest gap between consecutive neighbors in this list is 14: primes wander further apart as numbers grow, yet never run out — Euclid proved the supply is endless. The list stays tight as well: all 40 of these primes fit inside the range 2 through 173, where they make up about 23.1% of all integers — prime density thins slowly as numbers grow.

The first 40 prime numbers, in order from 2
#	Prime
1	2
2	3
3	5
4	7
5	11
6	13
7	17
8	19
9	23
10	29
11	31
12	37
13	41
14	43
15	47
16	53
17	59
18	61
19	67
20	71
21	73
22	79
23	83
24	89
25	97
26	101
27	103
28	107
29	109
30	113
31	127
32	131
33	137
34	139
35	149
36	151
37	157
38	163
39	167
40	173

Frequently asked questions

What are the first 40 prime numbers?

The first 40 primes are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29….

What is the 40th prime number?

173 is the 40th prime number.

Why is 1 not a prime number?

A prime must have exactly two distinct factors: 1 and itself. The number 1 has only one factor, so it is not prime (and not composite either).

Related calculators

Prime Checker Prime Factorization All tables

#	Prime
1	2
2	3
3	5
4	7
5	11
6	13
7	17
8	19
9	23
10	29
11	31
12	37
13	41
14	43
15	47
16	53
17	59
18	61
19	67
20	71
21	73
22	79
23	83
24	89
25	97
26	101
27	103
28	107
29	109
30	113
31	127
32	131
33	137
34	139
35	149
36	151
37	157
38	163
39	167
40	173

#	Prime
1	2
2	3
3	5
4	7
5	11
6	13
7	17
8	19
9	23
10	29
11	31
12	37
13	41
14	43
15	47
16	53
17	59
18	61
19	67
20	71
21	73
22	79
23	83
24	89
25	97
26	101
27	103
28	107
29	109
30	113
31	127
32	131
33	137
34	139
35	149
36	151
37	157
38	163
39	167
40	173