A105458 Number of irregular primes less than 3^n.

0, 0, 0, 3, 9, 48, 131, 334, 880, 2355, 6341, 17157, 47620, 132015, 366790, 1025835, 2884928, 8143498

Offset: 1

Author

Robert G. Wilson v, Apr 07 2005

Keywords

• hard
• nonn
• more

Crossrefs

Cf. A055729, A105462, A105467.

Programs

Mathematica

ip={ the list of irregular primes to 12 million }; Table[ Length[ Select[ip, # < 3^n &]], {n, 14}]

Extensions

a(15)-a(18) from Amiram Eldar, Mar 05 2019