66643

Properties

Appears in sequences

• Numbers n such that n, 10*n+1, 10*n+3, 10*n+7 and 10*n+9 are all primes.at n=20A067267
• Last prime in n-th group in A077280.at n=6A077283
• Beastly primes (version 2): primes containing 666 as a substring.at n=8A131645
• Coefficients of the sixth-order mock theta function phi_{-}(q).at n=35A153251
• The number of order-decreasing partial isometries (of an n-chain).at n=15A184052
• Primes having only {3, 4, 6} as digits.at n=32A199346
• Prime numbersat n=6644