A136669 - OEIS

A136669

Primes of the form colossally abundant number - 1.

5, 11, 59, 359, 5039, 55439, 1441439, 135483209545341953934626770390607999, 21406347108164028721671029721716063999, 6223083124956116561507895939157782409673929631999, 78232234099885463677928129398618807521962436643076243437332696602750813193299417065162966120702842438719999

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

The n-th colossally abundant number - 1 is prime for n = 2, 3, 4, 6, 8, 9, 11, 34, 36, 43, 73, 81, 86, 115.

LINKS

Table of n, a(n) for n=1..11.

FORMULA

{A004490(i) - 1} INTERSECTION A000040.

EXAMPLE

A004490(11) = 1441440, and 1441440 - 1 = 1441439 is prime.

CROSSREFS