A176903 Primes of the form colossally abundant number + 1.

3, 7, 13, 61, 2521, 55441, 4324321, 367567201, 6064949221531201, 9200527969062830401, 37188534050951960476801, 8201519488959040182625924708238885435575055666675808001

Offset

1,1

Comments

The next term is too large to be displayed here.

The n-th colossally abundant number + 1 is prime for n = 1, 2, 3, 4, 7, 9, 12, 14, 21, 23, 26, 46, 65, 69, 143, 147.

Links

Table of n, a(n) for n=1..12.

Formula

{A004490(i) + 1} INTERSECTION A000040.

Example

A004490(12) = 4324320, and 4324320 + 1 = 4324321 is prime.
A004490(46) + 1 = 8201519488959040182625924708238885435575055666675808001 is prime.

Crossrefs

Cf. A000040, A004490, A136669, A181561, A181562.

Sequence in context: A103564 A083201 A228209 * A004060 A028491 A137474

Adjacent sequences: A176900 A176901 A176902 * A176904 A176905 A176906

Keyword

nonn

Author

Jonathan Vos Post, Jan 31 2011

Status

approved