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Search: id:A158571
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| A158571 |
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Primes whose digit sum is a single digit non-prime. |
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1
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| 13, 17, 31, 53, 71, 103, 107, 211, 233, 251, 431, 503, 521, 701, 1021, 1061, 1151, 1201, 1223, 1511, 1601, 2011, 2141, 2213, 2411, 3001, 3023, 3041, 3203, 3221, 4013, 4211, 5003, 5021, 6011, 6101, 7001, 10007, 10061, 10111, 10133, 10151, 10223, 10313
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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It is interesting to observe that it is hard to find (I found none) primes whose digit sum is 6. On the contrary, it is easier to find primes whose digit sum is 8.
The digit sum 6 does not occur here because a number with digit sum 6 is divisible by 3 and therefore not prime. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Mar 26 2009]
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LINKS
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Chris Caldwell, The First 1,000 Primes
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FORMULA
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Union of A062339 and A062343. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Mar 26 2009]
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EXAMPLE
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1061 is a prime whose digit sum is 8 - which is a single digit non-prime.
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CROSSREFS
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Cf. A158217
Sequence in context: A116671 A062338 A143863 this_sequence A159614 A158087 A126808
Adjacent sequences: A158568 A158569 A158570 this_sequence A158572 A158573 A158574
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KEYWORD
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base,nonn
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AUTHOR
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Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Mar 21 2009
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EXTENSIONS
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Extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Mar 26 2009
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