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Search: id:A108816
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| A108816 |
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Primes of the form n*10^x+n+1, where 0 < n < 9, x=0,1,2.. |
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+0
1
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| 3, 5, 7, 11, 13, 17, 23, 67, 89, 607, 809, 2003, 6007, 8009, 200003, 2000003, 8000009, 20000003, 600000007, 6000000007, 2000000000003, 8000000000009, 20000000000000003, 200000000000000003, 60000000000000000007
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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n=2,x=3. a(x,n) = 2*10^3+2+1 = 2003 prime.
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PROGRAM
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(PARI) n10np1(n) = { local(x, y, k); for(x=0, n, for(k=1, 8, y=10^x*k+k+1; if(isprime(y), print1(y", ")) ) ) }
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CROSSREFS
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Sequence in context: A063908 A154868 A020628 this_sequence A088503 A118939 A087382
Adjacent sequences: A108813 A108814 A108815 this_sequence A108817 A108818 A108819
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KEYWORD
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easy,nonn
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AUTHOR
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Cino Hilliard (hillcino368(AT)gmail.com), Jul 10 2005
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