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Search: id:A056803
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| A056803 |
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Numbers n such that 12 repeated n times followed by 1 is a palindromic prime. |
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+0
2
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OFFSET
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1,1
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LINKS
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P. De Geest, SUPP Reference Table
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EXAMPLE
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12121212121 is prime so 5 appears in the sequence.
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MATHEMATICA
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Do[m = n; If[PrimeQ[120(10^(2n) - 1)/99 + 1], Print[n]], {n, 1, 600}]
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CROSSREFS
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Corresponding primes are given in A092696. Corresponding decimal digit lengths are given in A062209. a(k) = (A062209(k-1)-1)/2.
Adjacent sequences: A056800 A056801 A056802 this_sequence A056804 A056805 A056806
Sequence in context: A096729 A001775 A110026 this_sequence A071706 A084253 A025093
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KEYWORD
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nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 22 2000
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EXTENSIONS
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More terms from Rick L. Shepherd (rshepherd2(AT)hotmail.com), Mar 04 2004
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