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

Author

Max Alekseyev and Jud McCranie, Aug 08 2005

Keywords

• nonn

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.