66809

Properties

Appears in sequences

• a(n) = Sum_{k=1..n} k*[ (n/k)*[ (n/k)*[ n/k ] ] ].at n=34A024933
• Molien series for Hecke group H_{3,4}.at n=26A027631
• Primes having only {0, 6, 8, 9} as digits.at n=22A053580
• Primes that contain all the digits {0,6,8,9} and only these digits.at n=9A156200
• Number of n X 2 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of elements above it or two plus the sum of the elements diagonally to its northwest, modulo 4.at n=34A239844
• Number of nX5 0..3 arrays with no element equal to one plus the sum of elements to its left or zero plus the sum of elements above it or zero plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.at n=6A240759
• Primes obtained by merging 5 successive digits in the decimal expansion of sqrt(2) + sqrt(3) + sqrt(5).at n=2A241221
• Triangle read by rows: T(n,k) number of ways of partitioning the (n+4)-element multiset {1,1,1,1,1,2,3,...,n} into exactly k nonempty parts, n >= 0 and 1 <= k <= n + 4.at n=79A291119
• Balanced primes of order one ending in 9.at n=30A303095
• Primes p such that A001175(p) = (p-1)/7.at n=38A308792
• Invertible primes p such that k*p - 1 and k*p + 1 is a twin prime pair; for k = 12.at n=7A317029
• Sum of the second largest parts of the partitions of n into 9 parts.at n=45A326472
• Prime numbersat n=6658