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A178951 Numbers n such that A178609(n-1)=A178609(n)=A178609(n+1). 0
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 (list; graph; refs; listen; history; text; internal format)
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. A000040.

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

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Last modified May 27 16:48 EDT 2022. Contains 354110 sequences. (Running on oeis4.)