23275

Appears in sequences

• a(0) = 1, a(n) = 17*n^2 + 2 for n>0.at n=37A010007
• Binomial transform of A002487.at n=13A071014
• Sum of squares of digits of n is equal to the largest prime factor of n reversed, where the largest prime factor is not a palindrome.at n=35A074303
• Smaller of two consecutive numbers with the same prime signature not occurring earlier.at n=13A085929
• Larger members of primitive phi-amicable pairs.at n=16A121249
• Terms in A046034 which are pairwise products of terms in A046034.at n=20A153446
• a(n) = 44*n^2 - 1.at n=22A158628
• Number of simple labeled graphs on n+2 nodes with exactly n connected components that are trees or cycles.at n=19A215862
• a(n) = 19*n^2.at n=35A244631
• Numbers n such that n and n+1 both have 18 divisors.at n=1A274360
• a(n) = 4*n^3 - 3*n + 1.at n=18A280089
• Expansion of (Sum_{k>=0} x^(k^4))^19.at n=34A282288
• Expansion of Product_{k>=1} (1 - x^(7*k))^48/(1 - x^k)^49 in powers of x.at n=3A282930
• Numbers k such that k and k+1 both have more nonunitary than unitary prime divisors (A348121).at n=25A348122
• Abelian orders m for which there exist at least 4 groups of order m.at n=10A350323
• a(n) = Sum_{k=0..floor(n/3)} (n-k)!/(n-3*k)!.at n=11A358547