Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
editing
approved
Solutions of the equation (2*n+1)'=1, where n' is the arithmetic derivative of n. - Paolo P. Lava, Nov 15 2012
approved
editing
reviewed
approved
proposed
reviewed
editing
proposed
a(n) = A130290(n+1). - Chai Wah Wu, Jun 04 2022
def A005097(n): return (prime(n+1)-1)//2 # Chai Wah Wu, Jun 04 2022
(Python)
from sympy import prime
def A005097(n): return (prime(n+1)-1)//2 # Chai Wah Wu, Jun 04 2022
approved
editing
editing
approved
Peter Horak, and Bader F. AlBdaiwi, <a href="http://arxiv.org/abs/1109.3475">Diameter Perfect Lee Codes</a>, arXiv:1109.3475 [cs.IT], 2011-2012.
proposed
editing