30507

Appears in sequences

• a(n) = a(1) + a(2) + ... + a(n-1) + a(m) for n >= 4, where m = 2*n - 3 - 2^(p+1) and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = a(2) = 1 and a(3) = 2.at n=15A049936
• a(n) = A078223(n+1)/A078223(n).at n=11A078224
• Timestamps Hmmss where H,mm,ss are three consecutive primes, 0 < H < 24.at n=1A234631
• Numbers k such that 4*10^k + 19 is prime.at n=30A271548
• Expansion of Product_{i>=1, j>=1} (1 + x^(i*j*(j + 1)/2)).at n=46A327745