A074737 Let b(1)=b(2)=1, b(k+2)=gcd(k!,b(k+1)+b(k)); sequence gives values of k such that b(k)=1.

1, 2, 3, 6, 11, 14, 15, 24, 27, 36, 39, 41, 42, 51, 54, 56, 57, 66, 69, 74, 77, 87, 93, 96, 107, 114, 122, 126, 129, 131, 132, 143, 150, 162, 165, 189, 195, 200, 215, 227, 230, 234, 236, 237, 252, 258, 260, 261, 276, 282, 284, 285, 300, 306, 308, 309, 324, 330

Offset

1,2

Links

Table of n, a(n) for n=1..58.

Formula

a(n) seems to be asymptotic to c*n*log(n) with 1<c<3/2

Crossrefs

Sequence in context: A218155 A042944 A374913 * A361124 A163781 A090304

Adjacent sequences: A074734 A074735 A074736 * A074738 A074739 A074740

Keyword

nonn

Author

Benoit Cloitre, Sep 05 2002

Extensions

a(2) corrected by Sean A. Irvine, Jan 25 2025

Status

approved