49991

Properties

Appears in sequences

• Primes with either no internal digits or all internal digits are 9.at n=52A069684
• Primes of the form perfect_power(n)+n.at n=31A075781
• Numbers k such that R(k+9) = 5.at n=3A086949
• Expansion of (1 + 2*x^3)/(1 - x - 4*x^7).at n=31A098528
• Primes containing 999 as a substring.at n=12A167292
• Primes of the form 5*10^n-9.at n=2A177504
• Primes of the form 5n^2 - 9.at n=17A201790
• Number of "forceless" (or "useless") sequences in n-column Nonogram puzzle.at n=26A304179
• Full autoinsertable of reversed multidigit primes are such primes that remain prime after all the possible internal autoinsertions of the reversed prime, one at a time.at n=22A335314
• Primes having Fibonacci prime gaps to both neighbor primes.at n=12A353135
• Prime numbersat n=5131