A106095 Primes with maximal digit = 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

Offset: 1

Author

Zak Seidov, May 07 2005

Keywords

• nonn
• base

Links

• Robert Israel, Table of n, a(n) for n = 1..10000

Programs

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:
Res; # Robert Israel, Jan 01 2019

Mathematica

Select[Prime[Range[200]], Max[IntegerDigits[ # ]]==7&]