139999

Properties

Appears in sequences

• a(n) = smallest k such that 5k has a digit sum = n.at n=46A077492
• Smallest prime whose product of digits is 3^n.at n=9A088653
• Least prime whose absolute difference between the sum of its even decimal digits and the sum of its odd decimal digits is n.at n=40A114442
• Primes of the form a^a + b^b + c^c + d^d + e^e.at n=35A136292
• Primes of the form 14 n^2-1.at n=26A143832
• Irregular triangle, read by rows, of primes with prefix n and digits "9" appended, otherwise 0.at n=18A185687
• Primes that end in 999.at n=29A230202
• Square array read by antidiagonals upwards: M(n,k) is the initial occurrence of first prime p1 of consecutive primes p1, p2, where p2 - p1 = 2*k, and p1, p2 span a multiple of 10^n, n>=1, k>=1.at n=32A287050
• Expansion of x*(1 + 2*x*(5 - 4*x)*(1 + x^2)*(1 + x^4))/((1 - x)*(1 - 10*x^9)).at n=40A302556
• a(n) is the smallest m such that for any N, at least one of S(N), S(N+1), ..., S(N+m-1) is divisible by n, where S(N) is the sum of digits of N.at n=42A331788
• a(0) = 1; thereafter a(n) = 2*a(n-1) + 1, with digits rearranged into nondecreasing order.at n=28A346296
• Lexicographically earliest sequence of distinct positive terms such that the rightmost digit of a(n) concatenated with the leftmost digit of a(n+1) form an integer that is the sum of the digits of a(n) and a(n+1).at n=32A347353
• Numbers k such that k, prime(k) and primepi(reverse(prime(k))) are emirps (A006567).at n=13A382389
• Prime numbersat n=13010