140609

Appears in sequences

• a(n) = (10n+1)*(10n+9).at n=37A001535
• Expansion of e.g.f.: exp(tan(x).exp(x)).at n=8A009248
• Numbers k such that 30*k + {1,11,13,17,19,23,29} are all prime.at n=4A100418
• Numbers k such that (85*10^k + 473)/9 is prime.at n=26A283513
• Numbers k such that there are exactly 7 primes between 30*k and 30*k+30.at n=23A385124