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Search: id:A085448
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| A085448 |
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Primes having a semiprime number of 1's in their binary representation. |
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+0
3
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| 23, 29, 43, 53, 71, 83, 89, 101, 113, 139, 149, 163, 197, 263, 269, 277, 281, 293, 311, 317, 337, 347, 349, 353, 359, 373, 389, 401, 449, 461, 467, 523, 547, 571, 593, 599, 619, 643, 673, 683, 691, 739, 773, 797, 811, 821, 839, 853, 857, 881, 907, 937, 977
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Sequence of least prime with the number of 1's in its binary representation equal to n-th semiprime is: 23,311,991,2039,73727,63487,4128767,... What is the prime corresponding to 22?
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EXAMPLE
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The prime 43 = '101011' has four 1's and so is a term.
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CROSSREFS
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Cf. A001358, A081092.
Sequence in context: A162658 A007637 A161723 this_sequence A095077 A106989 A106988
Adjacent sequences: A085445 A085446 A085447 this_sequence A085449 A085450 A085451
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KEYWORD
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easy,nonn
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), Aug 14 2003
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