56697

Appears in sequences

• Expansion of e.g.f. exp(sec(x)*arcsinh(x)).at n=9A012821
• sinh(sec(x)*arcsinh(x))=x+3/3!*x^3+45/5!*x^5+1071/7!*x^7+56697/9!*x^9...at n=4A012827
• Numbers k such that phi(sigma(k)+k) = sigma(k).at n=24A068366
• a(n) = 9 + floor((3 + Sum_{j=1..n-1} a(j))/4).at n=39A120167
• Number of binary strings of length n with equal numbers of 0010 and 0101 substrings.at n=17A164167
• The smallest number such that n or more numbers k exist with k - a(n) = sopfr(k) + sopfr(a(n)), where sopfr(m) is the sum of the primes dividing m with repetition.at n=12A370352
• a(n) is the smallest number such that exactly n numbers k exist with k - a(n) = sopfr(k) + sopfr(a(n)), where sopfr(m) is the sum of the primes dividing m with repetition.at n=12A370356