24244

Appears in sequences

• G.f.: (1+x)^2/[(1-x)^4(1-x-x^2)^3].at n=8A001926
• McKay-Thompson series of class 18a for Monster.at n=63A058536
• McKay-Thompson series of class 18d for the Monster group.at n=21A058539
• Numbers k such that sigma(k) = bigomega(k) * phi(k).at n=11A067238
• Numbers n such that sigma(n)/phi(n) is prime.at n=33A067780
• Number of compositions into Fibonacci numbers (1 counted as two distinct Fibonacci numbers).at n=11A080888
• Output of the linear congruential pseudo-random number generator used in function rand() as described in Kernighan and Ritchie, when seeded with 0.at n=28A096554
• Square of Riordan array (1, x*c(x)) where c(x) is the g.f. of A000108.at n=47A127631
• Numbers n such that sigma(n) = 5*phi(n).at n=7A136547
• Numbers x such that (-1)sigma(x) | sigma(x), where (-1)sigma(x) is defined in A049060 and sigma(x) is the sum of the divisors of x (A000203).at n=44A258077
• Numbers n such that phi(n) = phi(n+11), with Euler's totient function phi = A000010.at n=24A276504
• Numbers with digits 2 and 4 only.at n=41A284920
• Primitive pseudoperfect numbers (A006036) that are not primitive abundant (A071395).at n=39A335290
• Number of Motzkin paths of length n avoiding UHHD.at n=16A347036
• Number of labeled simple graphs with n vertices contradicting a strict version of the axiom of choice.at n=6A367867