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*k+5)' = 1, where k' is the arithmetic derivative of k. - Paolo P. Lava, Nov 15 2012
approved
editing
(MAGMAMagma) [n: n in [0..200]| IsPrime(2*n+5)] // Vincenzo Librandi, Nov 17 2010
reviewed
approved
proposed
reviewed
editing
proposed
Nonnegative numbers n k such that 2n2k+5 is prime.
Solutions of the equation (2*nk+5)' = 1, where nk' is the arithmetic derivative of nk. - Paolo P. Lava, Nov 15 2012
a(n) = (A086304(n-1) + 1)/2, n > 1.
proposed
editing
editing
proposed
Solutions of the equation (2*n+5)' = 1, where n' is the arithmetic derivative of n. - Paolo P. Lava, Nov 15 2012
a(n) = (A086304(n-1) + 1)/2, n>1.
(MAGMA) [n: n in [0..1000200]| IsPrime(2*n+5)] // Vincenzo Librandi, Nov 17 2010
(Sage) [n for n in (0..200) if is_prime(2*n+5) ] # G. C. Greubel, May 21 2019
(GAP) Filtered([0..200], k-> IsPrime(2*k+5) ) # G. C. Greubel, May 21 2019
approved
editing
editing
approved