31499

Appears in sequences

• Numbers n such that sigma(sigma(n) - phi(n)) = phi(sigma(n) + phi(n)).at n=11A074876
• a(n) = 900*n - 1.at n=34A158409
• Smallest positive integer m such that m, m+1, m+2, m+3 are divisible by 2n+1, 2n+3, 2n+5, 2n+7 respectively.at n=6A279259
• Number of set partitions of [n] such that the smallest element of each block is odd.at n=12A290383
• Numbers k such that 6*10^k - 91 is prime.at n=22A294945
• Expansion of Sum_{j>=0} j!*x^j / Product_{k=1..j} (1 - k^2*x).at n=6A307375
• a(n) is the smallest ludic number L(k) such that the n-th difference of (L(k), ..., L(k+n)) is zero, where L is A003309; a(n) = 0 if no such number exists.at n=10A350006