40213

Properties

Appears in sequences

• Number of ordered 5-tuples of integers from [ 1..n ] with no global factor.at n=19A015650
• Fibonacci sequence beginning 1, 9.at n=19A022099
• Numbers n such that n, 10*n+1, 10*n+3, 10*n+7 and 10*n+9 are all primes.at n=10A067267
• Primes whose digits can be arranged in increasing cyclic order - to form a substring of 123456789012345678901234567890...at n=47A068710
• Smaller of two consecutive primes which are anagrams of each other.at n=11A069567
• List of Ormiston prime pairs.at n=22A072274
• Five-digit primes which use each of the decimal digits 0 through 4 exactly once.at n=10A109176
• Primes p such that the multiplicative order of 2 modulo p is (p-1)/9.at n=28A152309
• Primes formed by rearranging five consecutive decimal digits (avoiding leading 0).at n=13A156119
• Smaller prime p in Ormiston pairs (p, q) with q - p = 18.at n=10A163678
• Duplicate of A163678.at n=10A175517
• Primes p such that p^2 - 8, p^2 - 6 and p^2 - 2 are prime.at n=15A176960
• Primes whose digits can be arranged as consecutive digits (more precisely, to form a substring of 0123456789).at n=34A177119
• Primes whose digits are a permutation of (0, ..., m) for some m.at n=10A187796
• Numbers whose digits are a permutation of [0,...,n] and which contain the product of any two adjacent digits as a substring.at n=28A203569
• In base 5, numbers n which have 5 distinct digits, do not start with 0, and have property that the product (written in base 5) of any two adjacent digits is a substring of n.at n=12A210016
• Let an integer with k+1 digits as n = d(k)*10^k + d(k-1)*10^(k-1) + ... + d(0)*10^0 and consider the transform T(n) = k*10^d(k) + (k-1)*10^d(k-1) + ... + 0*10^d(0). a(n) gives the fixed points of the transform T(n).at n=33A226767
• Expansion of Sum_{k>=0} x^((k+1)^2)/(1-x)^k.at n=61A236310
• Primes p such that 10p + 1, 100p + 1 and 1000p + 1 are also primes.at n=36A243962
• Least prime q such that (r-q)/(q-p), where p<q<r are three consecutive primes, produces a new ratio <= 1, arranged by Farey fractions A038566/A038567.at n=31A279067