47777

Properties

Appears in sequences

• a(n) = (2n+1)! * [x^(2n+1)]; expansion of arcsin(tan(x)+arcsin(x)).at n=3A012950
• Primes that contain digits 4 and 7 only.at n=5A020465
• Smallest prime containing exactly n 7's.at n=4A037067
• Numbers having four 7's in base 10.at n=4A043520
• Primes of the form abbbbb... where a and b are digits.at n=53A061022
• Smallest prime ending in exactly n 7's.at n=3A065581
• Primes with either no internal digits or all internal digits are 7.at n=48A069682
• a(1) = 1, a(n) = prime equal to n-th partial sum of A073852.at n=16A073854
• Primes of the form identical digits preceded by a 4.at n=7A090152
• Primes of the form 4*10^k + 7*R_k, where R_k is the repunit (A002275) of length k.at n=1A093940
• Lesser of twin balanced primes (A090403).at n=21A096694
• Near-repdigit primes with 7 as repeated digit.at n=19A105977
• Smallest prime of the form 4 followed by n copies of k.at n=3A112748
• a(n) is the least prime containing n distinct occurrences of the n-th prime.at n=3A124046
• Primes with at least one digit appearing exactly four times in the decimal expansion.at n=19A161786
• Primes containing 777 as a substring.at n=11A167282
• Primes having only {3, 4, 7} as digits.at n=40A199347
• Primes having only {4, 5, 7} as digits.at n=21A217039
• Number of subsets of {1,...,n} containing n and having at least one set partition into 6 blocks with equal element sum.at n=11A248115
• Primes of form n^2 + 4096.at n=31A256836