A054256 Concatenation of n in base 2 up to base 10 is prime, all numbers are interpreted as decimals.

7, 33, 169, 197, 209, 351, 401, 419, 459, 541, 553, 599, 883, 971, 981, 1081, 1107, 1201, 1351, 1363, 2011, 2321, 2347, 2563, 2607, 2679, 2703, 2861, 2869, 2909, 2959, 3033, 3067, 3177, 3333, 3403, 3437, 3461, 3471, 3513, 3601, 3647, 3769, 3821, 3833

Offset

0,1

Links

Harvey P. Dale, Table of n, a(n) for n = 0..1000

Example

a(1)=7 -> 111{2}=21{3}=13{4}=12{5}=11{6}=10{7}=7{8}=7{9}=7{10} -> 1112113121110777 is a prime.

Mathematica

Select[Range[4000], PrimeQ[FromDigits[Flatten[Table[IntegerDigits[#, n], {n, 2, 10}]]]]&] (* Harvey P. Dale, Aug 20 2017 *)

Crossrefs

Cf. A054257, A054258.

Sequence in context: A344816 A295270 A275860 * A085636 A064306 A292427

Adjacent sequences: A054253 A054254 A054255 * A054257 A054258 A054259

Keyword

nonn,base

Author

Patrick De Geest, Feb 15 2000

Status

approved