26743

Appears in sequences

• Composite numbers which in base 6 contain their largest proper factor as a substring.at n=11A063156
• Duplicate of A063156.at n=11A063876
• Indices of primes in sequence defined by A(0) = 37, A(n) = 10*A(n-1) + 27 for n > 0.at n=10A101849
• Numbers k with the property that it is possible to write the base 2 expansion of k as concat(a_2,b_2), with a_2>0 and b_2>0 such that, converting a_2 and b_2 to base 10 as a and b, we have sigma(a + b) = sigma(k).at n=15A258843
• Numbers k such that (83*10^k - 29) / 9 is prime.at n=24A278418