The On-Line Encyclopedia of Integer Sequences (OEIS)

A181561 revision #3

A181561

Primes of the form highly abundant number + 1.

2, 3, 5, 7, 11, 13, 17, 19, 31, 37, 43, 61, 73, 97, 109, 181, 211, 241, 337, 421, 541, 601, 631, 661, 1009, 1201, 1621, 1801

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OFFSET

1,1

LINKS

FORMULA

{A002093(i) + 1} INTERSECTION A000040.

{1 + (sigma(n) > sigma(m) for all m < n + 1)} INTERSECTION A000040.

EXAMPLE

The 52nd highly abundant number is 1800, add one to get 1801 which is prime.

CROSSREFS

KEYWORD

nonn,easy

AUTHOR

Jonathan Vos Post (jvospost3(AT)gmail.com), Jan 29 2011

STATUS

proposed