49340

Appears in sequences

• Numbers k such that 2*3^k - 1 is prime.at n=28A003307
• Engel expansion of 1/Pi.at n=8A014012
• First differences (A131771) equal this sequence with terms repeated at positions: {m*(m+1)/2, m>=0}.at n=30A131770
• First differences (A131772) equal this sequence with zeros inserted at positions {m*(m+1)/2, m>=0}.at n=37A131771
• Partial sums (A131771) equal this sequence excluding zeros located at positions {m*(m+1)/2, m>=0}, with a(0)=1.at n=45A131772
• Expansion of Product_{k>=1} (1 + x^k)^(2^k-1).at n=12A319919