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10^1--10^19以内以1,3,7,9结尾的素数个数
A073505 A073506 A073507 A073508
Number of primes == 1 (mod 10) less than 10^n.
Number of primes == 3 (mod 10) less than 10^n.
Number of primes == 7 (mod 10) less than 10^n.
Number of primes == 9 (mod 10) less than 10^n.
1 0 1 1 1 1 1 0
2 5 2 7 2 6 2 5
3 40 3 42 3 46 3 38
4 306 4 310 4 308 4 303
5 2387 5 2402 5 2411 5 2390
6 19617 6 19665 6 19621 6 19593
7 166104 7 166230 7 166211 7 166032
8 1440298 8 1440474 8 1440495 8 1440186
9 12711386 9 12712499 9 12712314 9 12711333
10 113761519 10 113765625 10 113764039 10 113761326
11 1029517130 11 1029509448 11 1029518337 11 1029509896
12 9401960980 12 9401979904 12 9401997000 12 9401974132
13 86516370000 13 86516427946 13 86516367790 13 86516371101
14 801235218413 14 801235615814 14 801235612994 14 801235303579
15 7461142367846 15 7461142986919 15 7461142817661 15 7461142250241
16 69809584339041 16 69809586013590 16 69809586085287 16 69809584596005
17 655889287901522 17 655889293244254 17 655889291466273 17 655889285042182
18 6184988567236903 18 6184988573601294 18 6184988574866752 18 6184988572035909
19 58514416799532817 19 58514416825412307 19 58514416858480424 19 58514416792919057
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