Find all triples of positive integers $(a,b,p)$ with $a,b$ positive integers and $p$ a prime number such that $2^a+p^b=19^a$
1. We start with the given equation:
   \[
   2^a + p^b = 19^a
   \]
   where \(a\) and \(b\) are positive integers, and \(p\) is a prime number.

2. Rearrange the equation to isolate \(p^b\):
   \[
   p^b = 19^a - 2^a
   \]

3. We use the Lifting The Exponent (LTE) lemma to analyze the \(17\)-adic valuation of both sides. According to the LTE lemma:
   \[
   \nu_{17}(19^a - 2^a) = \nu_{17}(19 - 2) + \nu_{17}(a) = \nu_{17}(17) + \nu_{17}(a) = 1 + \nu_{17}(a)
   \]
   Since \(p\) is a prime and \(\nu_{17}(p^b) \geq 1\), it follows that \(p\) must be \(17\).

4. Substitute \(p = 17\) into the original equation:
   \[
   2^a + 17^b = 19^a
   \]

5. **Case 1: \(17 \nmid a\)**

   - Since \(17 \nmid a\), \(\nu_{17}(17^b) = 1\), which implies \(b = 1\).
   - Substitute \(b = 1\) into the equation:
     \[
     2^a + 17 = 19^a
     \]
   - We need to find \(a\) such that this equation holds. Testing small values of \(a\):
     - For \(a = 1\):
       \[
       2^1 + 17 = 19^1 \implies 2 + 17 = 19 \implies 19 = 19
       \]
       This is true, so \(a = 1\) works.
     - For \(a > 1\):
       \[
       19^a - 2^a > 17
       \]
       This inequality holds for all \(a > 1\), so no other values of \(a\) satisfy the equation.

   - Therefore, \((a, b, p) = (1, 1, 17)\) is a solution.

6. **Case 2: \(17 \mid a\)**

   - Let \(a = 17k\) for some positive integer \(k\).
   - Substitute \(a = 17k\) into the equation:
     \[
     2^{17k} + 17^b = 19^{17k}
     \]
   - Consider the equation modulo 4:
     \[
     2^{17k} + 17^b \equiv 1 \pmod{4}
     \]
     \[
     19^{17k} \equiv 3^{17k} \equiv (-1)^{17k} \equiv (-1)^k \pmod{4}
     \]
     This forces \(k\) to be even, so let \(k = 2n\).

   - Substitute \(k = 2n\) into the equation:
     \[
     2^{34n} + 17^b = 19^{34n}
     \]
   - Consider the equation modulo 6:
     \[
     2^{34n} + 17^b \equiv 2^{2n} + (-1)^b \equiv 3 \text{ or } 5 \pmod{6}
     \]
     \[
     19^{34n} \equiv 1 \pmod{6}
     \]
     This is a contradiction because \(2^{2n} + (-1)^b\) cannot be congruent to 1 modulo 6.

   - Therefore, there are no solutions when \(17 \mid a\).

In conclusion, the only solution is:
\[
\boxed{(a, b, p) = (1, 1, 17)}
\]