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A228359 Numbers n such that its 10's complement is not prime, i.e., 10^k-n, where k is the number of digits of n, is not prime. 1
1, 2, 4, 6, 9, 10, 12, 13, 14, 15, 16, 18, 19, 20, 22, 23, 24, 25, 26, 28, 30, 31, 32, 34, 35, 36, 37, 38, 40, 42, 43, 44, 45, 46, 48, 49, 50, 51, 52, 54, 55, 56, 58, 60, 61, 62, 64, 65, 66, 67, 68, 70, 72, 73, 74, 75, 76, 78, 79, 80, 82, 84, 85, 86, 88, 90, 91, 92 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

MATHEMATICA

Select[Range[100], ! PrimeQ[10^(IntegerLength[#]) - #]&]

CROSSREFS

Cf. A228075.

Sequence in context: A178126 A162202 A210380 * A156165 A024968 A047411

Adjacent sequences:  A228356 A228357 A228358 * A228360 A228361 A228362

KEYWORD

nonn,easy,base,less

AUTHOR

Vincenzo Librandi, Aug 21 2013

STATUS

approved

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Last modified March 19 17:21 EDT 2019. Contains 321330 sequences. (Running on oeis4.)