A105464 Irregular primeth recurrence: a(n+1) = a(n)-th irregular prime.

1, 37, 613, 12923, 390581, 15353617, 756551141

Offset

1,2

Comments

There are 310443 irregular primes less than 12 million.

Links

Table of n, a(n) for n=1..7.

Mathematica

ip={ the list of irregular primes to 12 million }; NestList[ ip[[ # ]] &, 1, 2]

Crossrefs

Cf. A000928, A007097.

Sequence in context: A133998 A231381 A056217 * A140764 A348301 A228225

Adjacent sequences: A105461 A105462 A105463 * A105465 A105466 A105467

Keyword

hard,nonn

Author

Robert G. Wilson v, Apr 07 2005

Extensions

a(6)-a(7) from Amiram Eldar, Mar 05 2019

Status

approved