A178951 Numbers k such that A178609(k-1) = A178609(k) = A178609(k+1).

49, 61, 86, 96, 121, 122, 123, 124, 214, 215, 216, 256, 257, 258, 259, 260, 275, 325, 355, 356, 357, 412, 518, 519, 545, 546, 547, 588, 589, 771, 772, 773, 774, 775, 776, 777, 778, 779, 780, 827, 833, 840, 904, 905, 906, 982, 983, 984, 1176, 1177

Offset

1,1

Comments

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).

Links

Table of n, a(n) for n=1..50.

Formula

A178609(a(n)-1) = A178609(a(n)) = A178609(a(n)+1).

Prog

(Sage) is_A178951 = lambda n: len(set([A178609(n-1), A178609(n), A178609(n+1)])) == 1 # D. S. McNeil, Jan 04 2011

Crossrefs

Cf. A178609.

Sequence in context: A135145 A111327 A184033 * A202001 A038640 A326151

Adjacent sequences: A178948 A178949 A178950 * A178952 A178953 A178954

Keyword

nonn

Author

Juri-Stepan Gerasimov, Dec 31 2010

Status

approved