77641

Properties

Appears in sequences

• Primes p such that there exist primes p'<p"<p"'<p""<p such that the concatenation of any two among the {p,...,p""} is prime.at n=30A139005
• 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, -1), (0, 0, 1), (0, 1, 1), (1, 1, 0)}.at n=9A151033
• Primes of the form x^2 + 18480*y^2.at n=19A173274
• Primes p such that p,q,r,s are consecutive primes and 2p+9, 2q+9, 2r+9, 2s+9 are also primes.at n=16A190354
• Terms k of A112998 such that k+2 is nonsquarefree.at n=38A328160
• Number of perfect-powers x in the range 2^n <= x < 2^(n+1).at n=35A377435
• Prime numbersat n=7630