127139

Properties

Appears in sequences

• Primes that remain prime through 4 iterations of function f(x) = 2x + 1.at n=9A023302
• Primes that remain prime through 5 iterations of function f(x) = 2x + 1.at n=2A023330
• Initial (unsafe) primes of Cunningham chains of first type with length exactly 6.at n=2A059766
• Numbers n such that n, 2n+1, 3n+2, 4n+3 are primes.at n=30A067257
• Primes of the form 4*k-1 such that 8*k-1, 16*k-1 and 32*k-1 are also primes.at n=21A101795
• Primes of the form 4*k-1 such that 8*k-1, 16*k-1, 32*k-1 and 64*k-1 are also primes.at n=4A101995
• Smallest prime obtained as a concatenation of prime(n) and prime(m) with m > n.at n=30A113893
• 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), (-1, 1, 1), (0, 0, 1), (0, 1, -1), (1, 0, 1)}.at n=9A150418
• Primes with ten embedded primes.at n=24A179918
• Iterative procedure in A316941 applied to the odd composite numbers (A071904) (a(n) = -1 if no prime is ever reached).at n=30A276662
• Prime numbersat n=11911