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Search: id:A081500
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| A081500 |
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In the following triangle the n-th row begins with n and contains n-1 smallest numbers coprime to n and greater than n. Sequence gives the leading diagonal. |
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+0
2
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| 1, 3, 5, 9, 9, 19, 13, 21, 20, 31, 21, 43, 25, 43, 41, 45, 33, 67, 37, 67, 55, 67, 45, 91, 54, 79, 65, 89, 57, 137, 61, 93, 85, 103, 83, 139, 73, 115, 100, 137, 81, 185, 85, 137, 127, 139, 93, 187, 104, 171, 130, 161, 105, 211, 128, 183, 145, 175, 117, 281, 121, 187, 170
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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1
2 3
3 4 5
4 5 7 9
5 6 7 8 9
6 7 11 13 17 19
7 8 9 10 11 12 13
8 9 11 13 15 17 19 21
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PROGRAM
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(PARI) for(k=1, 100, s=k+1; i=k+1; while(i<k+(k), if(gcd(s, k)==1, i++); s++); print1(s-1, ", ")) - Lambert Herrgesell (zero815(AT)googlemail.com), Mar 14 2006
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CROSSREFS
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Cf. A081501.
Sequence in context: A112661 A092996 A062949 this_sequence A030365 A063038 A066769
Adjacent sequences: A081497 A081498 A081499 this_sequence A081501 A081502 A081503
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 25 2003
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EXTENSIONS
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More terms from Lambert Herrgesell (zero815(AT)googlemail.com), Mar 14 2006
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