A077583 Triangle read by rows in which the n-th row contains n numbers starting with n and not coprime to n, except the first row is {1}.

1, 2, 4, 3, 6, 9, 4, 6, 8, 10, 5, 10, 15, 20, 25, 6, 8, 9, 10, 12, 14, 7, 14, 21, 28, 35, 42, 49, 8, 10, 12, 14, 16, 18, 20, 22, 9, 12, 15, 18, 21, 24, 27, 30, 33, 10, 12, 14, 15, 16, 18, 20, 22, 24, 25, 11, 22, 33, 44, 55, 66, 77, 88, 99, 110, 121, 12, 14, 15, 16, 18, 20, 21, 22

Offset

1,2

Links

Table of n, a(n) for n=1..74.

Example

1; 2,4; 3,6,9; 4,6,8,10; 5,10,15,20,25; 6,8,9,10,12,14; 7,14,21,28,35,42,49; ...

Crossrefs

Cf. A077584, A077660.

Sequence in context: A128556 A212485 A077661 * A153125 A359697 A139413

Adjacent sequences: A077580 A077581 A077582 * A077584 A077585 A077586

Keyword

nonn,tabl

Author

Amarnath Murthy, Nov 14 2002

Extensions

More terms from Sascha Kurz, Jan 11 2003

Status

approved