42459

Appears in sequences

• Beginning of n consecutive quadratic residues mod A025046(n).at n=26A048282
• Sequence obtained using characteristic polynomial that is Laplace transform of the tribonacci characteristic polynomial: -s^4*L(t^3 -t^2 -t -1) = s^3 +s^2 +2*s -6.at n=15A107785
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 0), (1, 0, -1), (1, 0, 1), (1, 1, 0)}.at n=8A150722
• Semiprimes q such that q^2-4 and q^2+4 are also semiprimes.at n=30A173084
• a(n) is the number of numbers m such that the number of iterations of r -> r - (largest divisor d < r) needed to reach 1 starting at r = m is equal to n.at n=22A175125
• a(n) = (n^4 + 16*n^3 + 65*n^2 + 26*n + 12)/12.at n=23A188480
• Number of strings of length n over a three-letter alphabet that begin with a nontrivial palindrome.at n=10A248122
• Integers n such that n+2!, n+2!+3!, n+2!+3!+4!, n+2!+3!+4!+5!, n+2!+3!+4!+5!+6!, and n+2!+3!+4!+5!+6!+7! are all prime.at n=23A267123