22399

Appears in sequences

• Pseudoprimes to base 42.at n=39A020170
• Numbers whose base-4 representation contains exactly four 1's and four 3's.at n=1A045133
• Starting positions of strings of 3 0's in the decimal expansion of Pi.at n=18A050202
• a(n) = index of the triangular number A076971(n).at n=27A076972
• a(n) = 14*n^2 - 1.at n=39A158485
• a(n) = 56*n^2 - 1.at n=19A158658
• Number of binary strings of length n with no substrings equal to 0000, 0001, or 0110.at n=18A164411
• a(n) = round(3*(4/3)^n).at n=31A227391
• Numbers that have all their divisors in A002191 (possible values for sigma(n), A000203).at n=44A243765
• a(n) = floor( prime(n)^3 / (n*log(n)) ).at n=32A259648
• Decimal representation of the middle column of the "Rule 129" elementary cellular automaton starting with a single ON (black) cell.at n=14A267444
• Numbers m such that D_{m-1} is the smallest base b > 1 for which b^{m-1} == 1 (mod m), where D_k is the denominator (A027642) of Bernoulli number B_k.at n=2A345675
• a(0) = 1; thereafter a(n) = 2*a(n-1) + 1, with digits rearranged into nondecreasing order.at n=20A346296