|
|
A106095
|
|
Primes with maximal digit = 7.
|
|
7
|
|
|
7, 17, 37, 47, 67, 71, 73, 107, 127, 137, 157, 167, 173, 227, 257, 271, 277, 307, 317, 337, 347, 367, 373, 457, 467, 547, 557, 571, 577, 607, 617, 647, 673, 677, 701, 727, 733, 743, 751, 757, 761, 773, 1117, 1171, 1217, 1237, 1277, 1307, 1327, 1367
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
MAPLE
|
Res:= 7:
A:= {7}: B:= {$1..6}:
for d from 2 to 4 do
A:= {seq(seq(10*a+i, i=0..7), a=A), seq(10*b+7, b=B)}:
B:= {seq(seq(10*b+i, i=0..6), b=B)}:
Res:= Res, op(sort(convert(select(isprime, A), list)))
od:
|
|
MATHEMATICA
|
Select[Prime[Range[200]], Max[IntegerDigits[ # ]]==7&]
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|