A130465 Triangle where the n-th row consists of the n smallest positive integers which are coprime to the number of divisors of n.

1, 1, 3, 1, 3, 5, 1, 2, 4, 5, 1, 3, 5, 7, 9, 1, 3, 5, 7, 9, 11, 1, 3, 5, 7, 9, 11, 13, 1, 3, 5, 7, 9, 11, 13, 15, 1, 2, 4, 5, 7, 8, 10, 11, 13, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 1, 5, 7, 11, 13, 17, 19, 23, 25, 29, 31, 35, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25

Offset

1,3

Links

Table of n, a(n) for n=1..91.

Example

Triangle begins:
1,
1, 3,
1, 3, 5,
1, 2, 4, 5,
1, 3, 5, 7, 9,
1, 3, 5, 7, 9, 11,
...

Crossrefs

Cf. A120841, A130466.

Sequence in context: A087493 A118125 A143732 * A348417 A356663 A272120

Adjacent sequences: A130462 A130463 A130464 * A130466 A130467 A130468

Keyword

nonn,tabl

Author

Leroy Quet, May 27 2007

Extensions

More terms from D. S. McNeil, Mar 23 2009

Status

approved