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Search: id:A069598
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| A069598 |
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Primes using only one nonzero digit (with zero digits allowed). |
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+0
3
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| 2, 3, 5, 7, 11, 101, 10111, 101111, 1011001, 1100101, 10010101, 10011101, 10100011, 10101101, 10110011, 10111001, 11000111, 11100101, 11110111, 11111101, 100100111, 100111001, 101001001, 101001011, 101100011, 101101111
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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From the fifth term onwards only zeros and ones are used.
Any number comprised only of a string of zeros and d's where d is a digit > 1 is divisible by d and not prime, so this sequence is the single-digit primes {2,3,5,7} UNION A020449.
The repunit primes (A004022) and A116692 are subsequences.
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CROSSREFS
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Cf. A020449, A004022, A116692.
Sequence in context: A084837 A062352 A033938 this_sequence A049575 A070028 A084836
Adjacent sequences: A069595 A069596 A069597 this_sequence A069599 A069600 A069601
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KEYWORD
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nonn,base
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 25 2002
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EXTENSIONS
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Edited by Rick L. Shepherd (rshepherd2(AT)hotmail.com), Sep 04 2009
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