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A070248
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Palindromic primes with digit sum 7.
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5
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7, 151, 313, 10501, 11311, 30103, 1201021, 3001003, 100050001, 100131001, 101030101, 110111011, 111010111, 10000500001, 1100011100011, 1100101010011, 100020010020001
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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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 == 7, Print[ FromDigits[p]]], {n, 1, 10^7}]
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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