71873

Appears in sequences

• Grundy function for turn-at-most-6-coins game.at n=40A054043
• Positions of check bits in code in A075937.at n=23A075939
• Numbers k such that k-1 and k+1 are each the product of exactly 7 primes, counted with multiplicity.at n=19A157487
• a(n) = 66*n^2 - 1.at n=32A158693
• a(n) = 54n^3 - 1.at n=10A181968
• Semiprimes p such that next semiprime after p is p+20.at n=20A217335
• Least positive integer k such that both k and k*n belong to the set {m>0: 2*prime(prime(m))+1 = prime(p) for some prime p}.at n=38A261362
• Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, west or southwest neighbor modulo 3 and the upper left element equal to 0.at n=11A266905