50401

Appears in sequences

• Strong pseudoprimes to base 15.at n=10A020241
• a(n) = n^4 - n^2 + 1.at n=15A060886
• a(n) = n*(6*n^2 - 7*n + 3)/2.at n=26A071230
• Smallest semiprime with same leading digits as n!.at n=6A095192
• Counterexamples to the conjecture that an even, prime-indexed triangular plus 1 equals a prime or that an odd, prime-indexed triangular minus 2 equals a prime.at n=25A097785
• a(n) = n^3 - 7*n + 7.at n=36A106734
• n! concatenated with n divided by n.at n=7A110414
• Highly composite numbers + 1.at n=26A135372
• a(n) = 56*n^2 + 1.at n=30A158660
• 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=40A189828
• Number of 2 X n 0..2 arrays with antidiagonals unimodal and rows and diagonals nondecreasing.at n=24A224000
• Number of length 5+2 0..n arrays with some pair in every consecutive three terms totalling exactly n.at n=7A245874