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Search: id:A109209
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| A109209 |
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Palindromic primes pp such that digit sum of pp as substring appears more than once in pp. |
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| 1123211, 1412141, 3228223, 3773773, 7949497, 9495949, 100161001, 101060101, 101141101, 110232011, 111050111, 112030211, 112111211, 113111311, 121111121, 122363221, 122444221, 125252521, 131030131, 131111131, 138313831, 138383831
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Cf. A052019 Sum of digits of prime p is substring of p, A109208 Palindromic primes pp such that digit sum of pp is its substring.
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EXAMPLE
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9495949is OK because its digit sum 49 appears twice in 9495949.
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MATHEMATICA
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bb={}; Do[id=IntegerDigits[p=Prime[n]]; If[StringCount[ToString[p], ToString[Plus@@id]]>1&&Reverse[id]==id, AppendTo[bb, p]], {n, 1000000}]; A109209=bb
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CROSSREFS
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Cf. A052019, A109208.
Sequence in context: A116175 A059767 A069583 this_sequence A100365 A084554 A114677
Adjacent sequences: A109206 A109207 A109208 this_sequence A109210 A109211 A109212
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KEYWORD
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base,nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Jun 22 2005
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