|
|
A054266
|
|
Sum of composite numbers between prime p and nextprime(p) is palindromic.
|
|
5
|
|
|
3, 5, 109, 193, 281, 509, 661, 827, 857, 1439, 2111, 3433, 3889, 3967, 4549, 6661, 7001, 8467, 10099, 17203, 18583, 21011, 21611, 23831, 24847, 25117, 26261, 26497, 26861, 28181, 29587, 30497, 31307, 47569, 47869, 49789, 53939, 54139, 66361
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
EXAMPLE
|
a(4)=193 since between 193 and next prime 197 we get the palindromic sum 194 + 195 + 196 = 585.
|
|
MATHEMATICA
|
okQ[l_]:=Module[{x=IntegerDigits[Total[Range[First[l]+1, Last[l]-1]]]}, x==Reverse[x]]; Transpose[Select[Partition[ Prime[Range[2, 6700]], 2, 1], okQ]][[1]] (* Harvey P. Dale, Mar 18 2011 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
|
|
EXTENSIONS
|
Corrected and extended b-file by Chai Wah Wu, Feb 25 2018
|
|
STATUS
|
approved
|
|
|
|