23413

Appears in sequences

• Numbers having four 5's in base 8.at n=27A043444
• a(n) = Sum_{k=0..floor(n/6)} C(n-3k,3k) * 2^k.at n=21A100135
• Indices of primes in sequence defined by A(0) = 43, A(n) = 10*A(n-1) + 33 for n > 0.at n=27A101730
• Positive numbers y such that y^2 is of the form x^2+(x+727)^2 with integer x.at n=8A159893
• Numbers n where tau(n) and n-tau(n) are perfect squares, with tau(n) the number of divisors of n (A000005).at n=40A245197
• Differentiate the g.f. underlying A032188 and evaluate it at x=1.at n=5A298013
• Number of integer partitions of n whose number of submultisets is greater than or equal to n.at n=38A325832
• Numbers that are the sum of eight fourth powers in exactly nine ways.at n=28A345841
• Semiprimes of the form k^2 + 4.at n=34A360741
• Squarefree semiprimes k such that k+1 is the product of three distinct primes and k+2 is the product of four distinct primes.at n=35A376352