1647086

Appears in sequences

• a(n) = 7^n + n^7.at n=7A001596
• Numbers that are the sum of 2 positive 7th powers.at n=27A003369
• Numbers that are the sum of at most 2 positive 7th powers.at n=35A004864
• a(n) = 2*n^n, n >= 2, otherwise a(n) = 1.at n=7A013499
• Triangle of coefficients in expansion of (2 + 7*x)^n.at n=34A013623
• n is equal to the number of 4s in all numbers <= n written in base 7.at n=5A014888
• n is equal to the number of 5s in all numbers <= n written in base 7.at n=13A014889
• Triangle of numbers in which i-th row is {2^(i-j)*7^j, 0<=j<=i}; i >= 0.at n=43A036565
• Triangle whose (i,j)-th entry is binomial(i,j)*7^(i-j)*2^j.at n=29A038268
• Sums of two powers of 7.at n=35A055258
• a(n) = n^n * (n^2 - 1)/24.at n=4A060348
• Numbers of the form a^a + b^b, a >= b > 0.at n=27A066846
• 7th binomial transform of (1,1,0,0,0,0,...).at n=7A081107
• Triangle read by rows: T(n,r) = n^r + r^n (1 <= r <= n).at n=27A093898
• Numbers of the form 7^p + p^7 for p prime.at n=3A097317
• a(n) = 2*7^(n-1).at n=7A109808
• a(n) = 7*a(n-2), a(0) = 1, a(1) = 2.at n=15A123752
• Numbers of the form a^b+b^a, a and b are primes.at n=15A173056
• Numbers of the form a^a + b^b, a>=b>=0.at n=35A218347
• Let d(1) < d(2) < ... < d(q) denote the divisors of k. Sequence lists numbers k > 1 such that d(1)/d(2) + d(2)/d(3) + ... + d(q-1)/d(q) is an integer.at n=26A227993