50399

Appears in sequences

• a(n) = 56*n^2 - 1.at n=29A158658
• Expansion of (5-19*x)/(1-10*x+23*x^2).at n=5A164038
• Numbers m such that m mod k is k-1 for all k = 2..9.at n=19A166931
• a(1)=1. a(n) = the smallest integer > a(n-1) such that d(a(n))+d(a(n)+1) > d(a(n-1))+d(a(n-1)+1), where d(m) = the number of divisors of m.at n=44A175143
• Numbers k for which d(k-1) + d(k+1) is a record, where d(k) is the number of divisors of k.at n=39A189828
• a(n) = Sum_{i=0..n} digsum_9(i)^4, where digsum_9(i) = A053830(i).at n=29A231687
• Numbers k where records occur for sigma(k+1)/sigma(k), where sigma(k) is the sum of divisors of k (A000203).at n=12A335067
• k such that 0 = Sum_{j=1..k} A373223(k, j). The indices of the rows in Gauss's triangle with vanishing row sums.at n=21A373181
• Positive numbers k such that (sin k)^k sets a new record.at n=9A383540