A115917 Numbers k such that sigma(k) - phi(k) is a brilliant number (A078972).

6, 10, 49, 242, 289, 512, 578, 800, 900, 1250, 2048, 5041, 15625, 17424, 22201, 22472, 26450, 28900, 48400, 60025, 62001, 65536, 69169, 91592, 131072, 144722, 146689, 151321, 160801, 201601, 212521, 236196, 242064, 252050, 253009

Offset

1,1

Links

Table of n, a(n) for n=1..35.

Example

sigma(62001) - phi(62001) = 49813 = 109*457.

Crossrefs

Cf. A078972, A115916.

Sequence in context: A083333 A032359 A346501 * A275004 A115741 A177168

Adjacent sequences: A115914 A115915 A115916 * A115918 A115919 A115920

Keyword

nonn,base

Author

Giovanni Resta, Feb 06 2006

Status

approved