OFFSET
1,19
COMMENTS
a(n) is called the weak irregular index of n-th prime, that is, the Bernoulli irregular index + Euler irregular index.
Prime(n) is a regular prime if and only if a(n) = 0.
Does every natural number appear in this sequence? For example, for the primes 491 and 1151, a(94) = a(190) = 4. (491 and 1151 are the only primes below 1800 with weak irregular index 4 or more.) However, does a(n) have a limit?
LINKS
Eric Weisstein's World of Mathematics, Irregular Pair
EXAMPLE
CROSSREFS
KEYWORD
nonn
AUTHOR
Eric Chen, Dec 26 2014
STATUS
approved