|
%I #19 Apr 27 2023 15:09:01
%S 49,61,86,96,121,122,123,124,214,215,216,256,257,258,259,260,275,325,
%T 355,356,357,412,518,519,545,546,547,588,589,771,772,773,774,775,776,
%U 777,778,779,780,827,833,840,904,905,906,982,983,984,1176,1177
%N Numbers k such that A178609(k-1) = A178609(k) = A178609(k+1).
%C Where A178609(n) is a measure of the largest index distance which allows prime(n) to be written as the arithmetic mean of two primes at equal distance to prime(n).
%F A178609(a(n)-1) = A178609(a(n)) = A178609(a(n)+1).
%o (Sage) is_A178951 = lambda n: len(set([A178609(n-1), A178609(n), A178609(n+1)])) == 1 # _D. S. McNeil_, Jan 04 2011
%Y Cf. A178609.
%K nonn
%O 1,1
%A _Juri-Stepan Gerasimov_, Dec 31 2010
|
