A359123 - OEIS

A359123

First differences of A068811, halved.

1, 1, 2, 3, 6, 6, 3, 3, 3, 6, 6, 3, 4, 8, 12, 18, 3, 6, 18, 6, 9, 12, 18, 15, 3, 3, 12, 9, 15, 6, 18, 6, 9, 6, 18, 6, 15, 9, 12, 3, 3, 15, 18, 12, 9, 6, 18, 6, 3, 18, 12, 12, 9, 6, 3, 3, 9, 3, 3, 7, 17, 9, 51, 6, 9, 6, 12, 21, 21, 3, 6, 27, 27, 30, 6, 27, 9, 21, 12, 36, 84, 6

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

LINKS

Michael De Vlieger, Table of n, a(n) for n = 1..10000

MATHEMATICA

1/2*Differences@ Select[Prime@ Range[300], PrimeQ[10^(1 + Floor@ Log10[#]) - #] &] (* Michael De Vlieger, Dec 18 2022 *)

CROSSREFS

Cf. A068811, A359121, A359122.

Sequence in context: A248896 A102402 A246129 * A124498 A197334 A113399

Adjacent sequences: A359120 A359121 A359122 * A359124 A359125 A359126

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Dec 18 2022

STATUS

approved