786431

Properties

Appears in sequences

• Class 1+ primes: primes of the form 2^i*3^j - 1 with i, j >= 0.at n=41A005105
• Primes of form 3*2^n - 1.at n=8A007505
• Primes such that p and p^2 have same set of digits.at n=17A030091
• a(0) = 1; a(n) = 3*2^n - 1, for n > 0.at n=18A052940
• a(2n) = 2*2^n - 1, a(2n+1) = 3*2^n - 1.at n=37A052955
• a(0) = 0; for n > 0, a(n) = 3*2^(n-1) - 1.at n=19A055010
• Smaller term of a pair of twin primes such that prime factors of their average are only 2 and 3.at n=11A059960
• Least m which can be written as i*j+i+j in n different ways: A072670(m)=n.at n=18A072671
• Number of 2-input gates used to synthesize parity function in disjunctive normal form (DNF) with n inputs.at n=15A074494
• Duplicate of A059960.at n=11A075582
• Lesser member p of a twin prime pair such that p+1 is 3-smooth.at n=12A078883
• a(n) is the smallest x such that the quotient d(x+1)/d(x) equals n, where d = A000005.at n=18A080371
• Variation on Ulam numbers: a(1) = 1; a(2) = 2; for n>2, a(n) = smallest (n odd) or largest (n even) number > a(n-1) that is a unique sum of two distinct earlier terms.at n=37A081026
• a(0) = 1; for n > 0, a(n) = 3*2^(n-1) - 1.at n=19A083329
• Add 1, double, add 1, double, etc.at n=37A083416
• Smaller member of a twin prime pair such that the sum sets a record for number of prime divisors (counted with multiplicity).at n=11A086827
• Smallest prime obtained as a sum of n terms of a geometric progression + the common ratio, or 0 if no such terms exists. Smallest prime of the form (a +ar +ar^2 + ar^3 +... ) + r.at n=17A088121
• Least number which when rotated through all its binary places produces n primes, not counting any repeats.at n=11A088148
• Smallest prime which when rotated through all its binary places produces n primes, not counting any repeats.at n=11A088149
• Smallest prime with exactly n consecutive ones in the longest run of ones in its binary expansion.at n=17A090593