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Search: id:A108835
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| A108835 |
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Primes such that the outer 2 digits are n and n-1 and all inner digits are 7, where 0 < n < 9. |
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+0
1
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| 271, 877, 2777771, 8777777777, 8777777777777777, 877777777777777777777777777777777, 2777777777777777777777777777777771, 877777777777777777777777777777777777777
(list; graph; listen)
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OFFSET
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1,1
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PROGRAM
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(PARI) n10np1(n, d) = { local(x, y, k); for(x=1, n, for(k=1, 8, y=10^(x+1)*k+floor(10^x*d/9)*10+k-1; if(isprime(y), print1(y", ")) ) ) }
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CROSSREFS
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Sequence in context: A142637 A157485 A038655 this_sequence A005933 A112820 A062906
Adjacent sequences: A108832 A108833 A108834 this_sequence A108836 A108837 A108838
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KEYWORD
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easy,nonn,base
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AUTHOR
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Cino Hilliard (hillcino368(AT)gmail.com), Jul 11 2005
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