A105463 The 10^n-th irregular prime.

37, 257, 1669, 22349, 294001, 3553267, 41892163, 481303351

Offset: 0

Author

Robert G. Wilson v, Apr 07 2005

Keywords

• hard
• nonn
• more

Crossrefs

Cf. A006988, A011557, A105468.

Programs

Mathematica

ip={ the list of irregular primes to 12 million }; Table[ ip[[10^n]], {n, 0, 5}]

Formula

a(n) = A000928(A011557(n)) = A000928(10^n). - Amiram Eldar, Mar 05 2019

Extensions

Offset changed and a(6)-a(7) added by Amiram Eldar, Mar 05 2019