A109322 a(n) is the minimum positive integer j such that [j, j+n-1] does not contain any values of sigma(k) (i.e., sum of all positive divisors of k).

2, 9, 9, 49, 49, 423, 423, 423, 423, 1333, 1333, 4425, 4425, 4425, 4425, 8763, 8763, 14089, 14089, 22825, 22825, 22825, 22825, 40291, 40291, 40291, 40291, 40291, 40291, 178705, 178705, 661285, 661285, 661285, 661285, 4543141, 4543141, 4543141, 4543141, 4543141, 4543141, 4543141, 4543141, 4543141, 4543141, 4543141, 4543141

Offset

1,1

Links

Donovan Johnson, Table of n, a(n) for n = 1..85 (terms < 10^10)

Art of Problem Solving, Gaps in {sigma(n)}...

Crossrefs

Cf. A002191, A083531, A109323, A109324, A110875.

Sequence in context: A168333 A238412 A242064 * A000587 A014182 A293037

Adjacent sequences: A109319 A109320 A109321 * A109323 A109324 A109325

Keyword

nonn

Author

Max Alekseyev and Jud McCranie, Aug 08 2005

Status

approved