21058

Appears in sequences

• Coordination sequence for MgNi2, Position Ni1.at n=36A009933
• Number of partitions satisfying 0 < cn(1,5) + cn(4,5).at n=37A039898
• Greatest number having exactly n representations as ab+ac+bc with 0 < a < b < c.at n=17A094377
• Greatest number having exactly n representations as ab+ac+bc with 1 <= a <= b <= c.at n=17A094380
• Numbers k such that the decimal digits of phi(k) are a permutation of those of k.at n=27A115921
• Composite numbers, not ending with 0, sharing a 3-digit sequence with some of its prime factors.at n=18A131523
• Sum of the numbers already killed in the first jump of a Sieve of Eratosthenes table.at n=31A179628
• Number of nondecreasing arrangements of n numbers in -3..3 with sum zero and sum of squares not greater than n*12/3.at n=29A183921