Prime patterns: 123456789…

10-digit number:
1234567891   is a prime number.

20-digit number:
12345678901234567891   is a prime number.

25-digit number:
1234567890000001234567891   is a prime number.

39-digit number:
123456789000000000000000000001234567891   is a prime number.

39-digit number:
123456789123456789123456789001234567891   is a prime number.
 
 

101   is a prime number.
120121   is a prime number.
12301231   is a prime number.
1234012341   =   3 * 2803 * 146749
123450123451   =   37 * 28393 * 117511
12345601234561   =   7 * 1763657319223   is a semiprime
1234567012345671   =   3 * 411522337448557   is a semiprime
123456780123456781   =   89 * 1387154832847829   is a semiprime

1013   is a prime number.
1019   is a prime number.

987654320987654323   is a prime number.
 
 
Find other primes with the same pattern
 
 
 

About benvitalis

math grad - Interest: Number theory
This entry was posted in Math Beauty and tagged . Bookmark the permalink.

2 Responses to Prime patterns: 123456789…

  1. This is cool, how did you come up with these?

  2. benvitalis says:

    I was just playing around with long strings with numbers.

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