66601

Properties

Appears in sequences

• First member of a prime quadruple in a 2p-1 progression.at n=28A057327
• First member of a prime 5-tuple in a 2p-1 progression.at n=7A057328
• Numbers n such that n divides the (left) concatenation of all numbers <= n written in base 14 (most significant digit on right).at n=16A061967
• Triangle of primes associated with A083773.at n=24A083775
• Number of subsets of the first n numbers having a common divisor greater than 1.at n=31A109511
• Beastly primes (version 2): primes containing 666 as a substring.at n=5A131645
• a(n) = 74*n^2 + 1.at n=30A158742
• 1/9 the number of (n+1) X 9 0..2 arrays with all 2 X 2 subblocks having the same four values.at n=14A184047
• Beastly primes (version 1): either 666 followed by 0's and a 1 or 7 at the right end or a palindrome with 666 in the center, 0's surrounding these digits, and 1 or 7 at both ends.at n=2A186086
• Primes having only {0, 1, 6} as digits.at n=25A199326
• Primes of the form 3*m^2 - 2.at n=23A201715
• Terms k of A112998 such that k+2 is nonsquarefree.at n=33A328160
• Prime numbersat n=6641