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A081500 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. 1
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; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

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

LINKS

Table of n, a(n) for n=1..63.

PROG

(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

CROSSREFS

Cf. A081501.

Sequence in context: A141264 A062949 A166651 * A030365 A316520 A153710

Adjacent sequences:  A081497 A081498 A081499 * A081501 A081502 A081503

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Mar 25 2003

EXTENSIONS

More terms from Lambert Herrgesell (zero815(AT)googlemail.com), Mar 14 2006

STATUS

approved

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Last modified August 8 06:27 EDT 2020. Contains 336290 sequences. (Running on oeis4.)