134150

Appears in sequences

• n*10^7-1, n*10^7-3, n*10^7-7 and n*10^7-9 are all prime.at n=5A064982
• a(0) = 0, a(1) = 1, for n > 1, a(n) = a(n-1) + a(n-A002487(n)).at n=35A283474