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Search: id:A070831
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| A070831 |
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Palindromic primes with digit sum = 11. |
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+0
1
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| 191, 353, 13331, 1123211, 1221221, 1303031, 1311131, 3103013, 110232011, 111050111, 112030211, 112111211, 121111121, 130030031, 301111103, 10000900001, 10002520001, 10013131001, 10111311101, 10301110301
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Conjecture: The sequence is unbounded.
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MATHEMATICA
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Do[p = Join[ IntegerDigits[n], Reverse[ Drop[ IntegerDigits[n], -1]]]; q = Plus @@ p; If[ PrimeQ[ FromDigits[p]] && q == 11, Print[ FromDigits[p]]], {n, 1, 10^6}]
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CROSSREFS
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Cf. A002385, A070247, A070248 and A070249.
Sequence in context: A146361 A142806 A142086 this_sequence A147108 A147116 A142677
Adjacent sequences: A070828 A070829 A070830 this_sequence A070832 A070833 A070834
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KEYWORD
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base,nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), May 15 2002
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