73327

Properties

Appears in sequences

• Let p be the n-th odd prime. a(n) is the least prime congruent to 7 modulo 8 such that Legendre(-a(n), q) = -Legendre(-1, q) for all odd primes q <= p.at n=8A001988
• Emirps with only prime digits (i.e., 2, 3, 5, 7).at n=28A128388
• Larger of emirps (pairs) with only prime digits (A128388).at n=10A133753
• Emirps with a prime number of only prime digits.at n=20A137833
• Larger of emirps (pairs) with a prime number of only prime digits.at n=6A137835
• Number of integer sequences b with b(1) = 1, b(m) > 0 and b(m+1) - b(m) > 0, of length n which transform under the map S into a nonnegative integer sequence. The transform c = S(b) is defined by c(m) = Product_{k=1..m} b(k) / Product_{k=2..m} (b(k) - b(k-1)).at n=6A356639
• Emirps p such that p == 1 (mod s) and R(p) == 1 (mod s), where R(p) is the digit reversal of p and s the sum of digits of p.at n=30A356947
• Emirps p such that 2*p - reverse(p) is also an emirp.at n=34A358689
• Prime numbersat n=7242