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A180949
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Prime numbers P such that 10^(n+d+1) + P*10^n + 1 is prime for n=1 to 5 with d = number of digits of P.
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0
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223283, 248903, 924773, 1469627, 2121767, 2428241, 2429411, 2614043, 2885453, 3444893, 3512849, 3564461, 4316141, 4438067, 4605977, 4980161, 5267519, 6248057, 6961673, 7519607, 8517563, 9716789, 9846443, 12383099, 13127507
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OFFSET
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1,1
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COMMENTS
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For P = 6961673,9846443,17990729,28587371 Q is prime for n=1 to 6
For P = 5267519,27060587 Q is prime for n=1 to 7
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LINKS
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EXAMPLE
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5267519
1052675191
10526751901
105267519001
1052675190001
10526751900001
105267519000001
1052675190000001
are all prime numbers
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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