1,1

These numbers when factored are 2*3, 2*3*11, 2*3*11*131, 2*3*11*131*17291, 2*3*11*131*17291*298995971, 2*3*11*131*8779*10079*17291*298995971*1010341471, 2*3*11*29*59*131*241*8779*10079*17291*298995971*1010341471*2511683491*7716660340023314591, so a(n) is a prime multiple of a(n-1) for 2<=n<=6. 2,3,11,131,17291,298995971 are A090475 [Beginning with 2, a(n+1) is the least prime == -1 (mod (product a(i), i=1 to n)).]

Cf. A090475.

Sequence in context: A006517 A091458 A087331 this_sequence A156458 A136268 A030242

Adjacent sequences: A097416 A097417 A097418 this_sequence A097420 A097421 A097422

nonn

Gerald McGarvey (Gerald.McGarvey(AT)comcast.net), Aug 19 2004