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A125213 a(n) = integers n such that no prime exists of the form abs(k! - 3n - 1), abs(k! - 3n), or abs(k! - 3n + 1). 2
17, 19, 29, 31, 45, 49, 57, 59, 63, 69, 73, 79, 83, 85, 87, 89, 97, 99, 101, 107, 109, 115, 119, 121, 129, 131, 135, 139, 143, 149, 151, 157, 159, 161, 165, 169, 171, 173, 177, 179, 185, 187, 189, 195, 197, 199, 209, 213, 217, 219, 223, 227, 229, 233, 235, 249, 255, 259 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

3*a(n) are the indices of the middle terms in the triples of consecutive zeros in A125211. The middle index of most consecutive zero triples in A125211 is odd and is a multiple of 3.

LINKS

Table of n, a(n) for n=1..58.

EXAMPLE

Triplets of consecutive zeros in A125211: {50,51,52}, {56,57,58}, {86,87,88}, {92,93,94}, ...

CROSSREFS

Cf. A125162, A125163, A125164, A125211, A125212.

Sequence in context: A060254 A190792 A137796 * A132246 A038969 A065742

Adjacent sequences:  A125210 A125211 A125212 * A125214 A125215 A125216

KEYWORD

nonn

AUTHOR

Alexander Adamchuk, Nov 23 2006

EXTENSIONS

Edited and extended by Max Alekseyev, Feb 10 2010

STATUS

approved

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Last modified December 9 08:41 EST 2021. Contains 349627 sequences. (Running on oeis4.)