71971

Properties

Appears in sequences

• Primes > 1000 in which every substring of lengths 2 and 3 are also prime.at n=12A069490
• Primes p such that p's set of distinct digits is {1,7,9}.at n=26A108384
• Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0100-0100-1111-0010-0010 pattern in any orientation.at n=14A147341
• T(n,k)=Number of binary arrays of length n+2*k-1 with no more than k ones in any length 2k subsequence (=50% duty cycle).at n=37A212402
• Number of binary arrays of length 2*n+1 with no more than n ones in any length 2n subsequence (=50% duty cycle).at n=7A212403
• Primes such that concatenation of two adjacent terms and two adjacent digits is also prime.at n=25A224929
• Least numbers k for each base b >= 2 such that N = b^(2^n) + k is prime for 7 consecutive values from n = 0 to n = 6.at n=14A225560
• Lexicographically largest strictly increasing sequence of primes for which the continued square root map produces Feigenbaum's constant delta = 4.6692016... (A006890).at n=36A257809
• Primes in Pi (variant of A336520): a(n) is the smallest prime factor of A090897(n) that does not appear in earlier terms of a, or 1, if no such factor exists.at n=20A336519
• Primes in Pi: a(n) is the smallest prime factor of A090897(n) that does not appear in earlier terms of A090897, or 1, if no such factor exists.at n=20A336520
• Primes which satisfy the requirements of A380943 in more than one way.at n=21A383810
• Primes which satisfy the requirements of A380943 in exactly two ways.at n=20A383811
• Prime numbersat n=7124