Primes whose first and last number is 3: Difference between revisions
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m (add 1x1, 5x5, 7x7, 9x9) |
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isxbyx(n, base=10, dig=3) = n ÷ prevpow(base, n) == dig && n % base == dig |
isxbyx(n, base=10, dig=3) = n ÷ prevpow(base, n) == dig && n % base == dig |
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for d in 1:2:9 |
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foreach(p -> print(rpad(last(p), 5), first(p) % 11 == 0 ? "\n" : ""), |
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enumerate(p3x3(4000, 10, d))) |
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end |
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</lang>{{out}} |
</lang>{{out}} |
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<pre> |
<pre> |
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1x1 primes < 4000: |
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11 101 131 151 181 191 1021 1031 1051 1061 1091 |
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1151 1171 1181 1201 1231 1291 1301 1321 1361 1381 1451 |
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1471 1481 1511 1531 1571 1601 1621 1721 1741 1801 1811 |
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1831 1861 1871 1901 1931 1951 |
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Total 1x1 primes less than 1,000,000: 2387. |
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3x3 primes < 4000: |
3x3 primes < 4000: |
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3 313 353 373 383 3023 3083 3163 3203 3253 3313 |
3 313 353 373 383 3023 3083 3163 3203 3253 3313 |
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Total 3x3 primes less than 1,000,000: 2251. |
Total 3x3 primes less than 1,000,000: 2251. |
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5x5 primes < 4000: |
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5 |
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Total 5x5 primes less than 1,000,000: 1. |
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7x7 primes < 4000: |
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7 727 757 787 797 |
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Total 7x7 primes less than 1,000,000: 2104. |
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9x9 primes < 4000: |
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919 929 |
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Total 9x9 primes less than 1,000,000: 2053. |
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=={{header|Nim}}== |
=={{header|Nim}}== |