91373

Properties

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 46.at n=6A031634
• Substrings from the right are prime numbers (using only odd digits different from 5).at n=36A032437
• a(1) = 9, a(n) = concatenation of two closest factors of a(n-1) whose product equals a(n-1) or if a(n-1) is a prime then the concatenation of 1 and a(n-1).at n=6A063423
• Numbers n such that phi(reverse(n)) = phi(reverse(n-1)) + phi(reverse(n-2)).at n=35A069969
• a(n) is the smallest number which has in its English name the letter "n" in the n-th position beginning the count from the end.at n=40A173204
• Prime numbers containing the digit string 137.at n=40A190307
• Prime numbersat n=8835