|
Search: id:A114758
|
|
|
| A114758 |
|
Smallest prime of the form: n successive positive integers in descending order followed by a 1. |
|
+0
9
|
|
| 11, 211, 5431, 76541, 17161514131, 1211109871, 98765431, 876543211, 9876543211, 242322212019181716151, 11109876543211, 1131121111101091081071061051041031021, 555453525150494847464544431
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
EXAMPLE
|
a(4) = 76541, four successive positive integers 7,6,5,4 in descending order followed by a 1.
|
|
MATHEMATICA
|
a[n_]:=(For[m=1, (v={}; Do[v=Join[v, IntegerDigits[k]], {k, m+n-1, m, -1}]); !PrimeQ[10FromDigits[v]+1], m++ ]; 10FromDigits[v]+1); Table[a[n], {n, 14}] - Farideh Firoozbakht
f[n_] := Block[{t = Reverse@Range@n}, While[p = FromDigits@Flatten@IntegerDigits@Join[t, {1}]; ! PrimeQ@p, t++ ]; p]; Array[f, 13] (* Robert G. Wilson v *)
|
|
CROSSREFS
|
Cf. A113514, A114754, A114755, A114756, A114757, A114759, A112716, A108145, A114761.
Sequence in context: A089567 A110747 A112704 this_sequence A088061 A070220 A134069
Adjacent sequences: A114755 A114756 A114757 this_sequence A114759 A114760 A114761
|
|
KEYWORD
|
base,nonn
|
|
AUTHOR
|
Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jan 01 2006
|
|
EXTENSIONS
|
Extended by Robert G. Wilson v (rgwv(at)rgwv.com), Ray Chandler (rayjchandler(AT)sbcglobal.net) and Farideh Firoozbakht (f.firoozbakht(AT)math.ui.ac.ir), Jan 02 2006
More terms from Robert G. Wilson v (rgwv(at)rgwv.com), Jan 03 2006
|
|
|
Search completed in 0.002 seconds
|
