A096524 - OEIS

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A096524

Numbers n such that n.0.n+1 is prime, where '.' represents concatenation. Or, n such that 10^(k+1)*n + n + 1 is prime, where k is the number of digits in n.

6, 8, 20, 36, 38, 42, 48, 50, 66, 72, 78, 96, 128, 140, 150, 152, 188, 212, 216, 218, 272, 296, 300, 318, 330, 336, 360, 366, 372, 386, 398, 408, 422, 446, 462, 482, 488, 492, 498, 542, 546, 552, 560, 570, 582, 608, 630, 638, 672, 678, 710, 716, 740, 756, 780

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

OFFSET

1,1

COMMENTS

See A096525 for the actual primes.

LINKS

Table of n, a(n) for n=1..55.

MATHEMATICA

Select[Range[1000], PrimeQ[FromDigits[Join[IntegerDigits[#], {0}, IntegerDigits[ #]]]+1]&] (* Harvey P. Dale, Nov 17 2014 *)

CROSSREFS

Sequence in context: A113806 A105775 A159469 * A083595 A064840 A306379

Adjacent sequences: A096521 A096522 A096523 * A096525 A096526 A096527

KEYWORD

base,easy,nonn

AUTHOR

Jason Earls, Jun 23 2004

STATUS

approved