71839

Appears in sequences

• Consider all ways of writing a number as p+2m^2 where p is 1 or a prime and m >= 0; sequence gives numbers that are expressible in at least 2 more ways than any smaller number.at n=28A016067
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 55 ones.at n=6A031823
• Composite numbers whose prime factors contain no digits other than 1 and 9.at n=30A036309
• a(n) = p^2*(p^2+2*p-1)/2, where p = prime(n).at n=7A229738
• a(n) = q^2*(q^2+2*q-1)/2, where q = n-th prime power A000961(n).at n=12A229739
• a(n) = (n^4 + 2*n^3 - n^2)/2.at n=19A255499
• Square array A(n,k), n >= 1, k >= 1, read by antidiagonals downwards, where A(n,k) = n! * k! * [x^n * y^k] (1/2) * (1 / (exp(x) + exp(y) - exp(x+y))^2 - 1).at n=47A382740
• Square array A(n,k), n >= 1, k >= 1, read by antidiagonals downwards, where A(n,k) = n! * k! * [x^n * y^k] (1/2) * (1 / (exp(x) + exp(y) - exp(x+y))^2 - 1).at n=52A382740