61455

Appears in sequences

• Numbers whose base-4 representation contains exactly four 0's and four 3's.at n=20A045085
• List of codewords in binary lexicode with Hamming distance 8 written as decimal numbers.at n=28A075940
• Numbers n such that at least one of the following four conditions is satisfied: 1# d(n)=phi(n); 2# d(n)=u(n); 3# phi(n)=u(n), or 4# n=2u(n). Here d(n)=A000005(n) is the number of divisors of n, phi(n)=A000010(n) is Euler's totient and u(n)=A045763(n) is the size of the 'unrelated set'.at n=10A083246
• Numbers whose set of base 16 digits is {0,F}, where F base 16 = 15 base 10.at n=9A097262
• A row sum triangular sequence: A(n,k)= A(n - 1, k - 1) + A(n - 1, k) + (n + 1)*(n + 2)*A(n - 2, k - 1).at n=30A153759
• A row sum triangular sequence: A(n,k)= A(n - 1, k - 1) + A(n - 1, k) + (n + 1)*(n + 2)*A(n - 2, k - 1).at n=33A153759
• Rows of negated binary Walsh matrices interpreted as reverse binary numbers.at n=27A228540
• a(n) = (n - 1)*(n^3 + 1) = n^4 - n^3 + n - 1, for n >= 1.at n=15A242604
• The number of upper-triangular matrices whose nonzero entries are positive odd numbers summing to n and each row and each column contains a nonzero entry.at n=10A289317
• Numbers in base 10 that are palindromic in bases 2, 4, and 16.at n=23A319583
• Numbers k such that 407*2^k+1 is prime.at n=25A323103
• For any number n with runs in binary expansion (r_w, ..., r_0), let p(n) be the polynomial of a single indeterminate x where the coefficient of x^e is r_e for e = 0..w and otherwise 0, and let q be the inverse of p; a(n) = q(p(n)^2).at n=12A355654