A061244 Prime numbers with odd digits in ascending order.

3, 5, 7, 11, 13, 17, 19, 37, 59, 79, 113, 137, 139, 157, 179, 199, 337, 359, 379, 557, 577, 599, 1117, 1399, 1559, 1579, 1777, 1999, 3359, 3557, 3559, 3779, 5557, 5779, 11113, 11117, 11119, 11159, 11177, 11399, 11579, 11777, 11779, 13337, 13339

Offset: 1

Author

Amarnath Murthy, Apr 23 2001

Keywords

• nonn
• base

Examples

			37 is a term since 3 and 7 are odd digits and 3 < 7.
		

Links

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

Crossrefs

Cf. A061245, A028864, A052015.

Programs

Maple

A061244:= {}:
for d from 1 to 20 do
  for n1 from 0 to d do
    x1:= (10^n1-1)/9;
    for n3 from 0 to d-n1 do
      x3:= x1*10^n3 + (10^n3-1)/9*3;
      for n5 from 0 to d-n1-n3 do
        x5:= x3*10^n5 + (10^n5-1)/9*5;
        for n7 from 0 to d-n1-n3-n5 do
          x7:= x5*10^n7 + (10^n7-1)/9*7;
          n9:= d-n1-n3-n5-n7;
          x:= x7*10^n9 + (10^n9-1);
          if isprime(x) then
            A061244:= A061244 union {x};
          fi
od od od od od:
A061244;
# Robert Israel, Apr 20 2014

Extensions

More terms from Patrick De Geest, Jun 04 2001