23440

Appears in sequences

• Values that show the slow decrease in the Andrica function Af(k) = sqrt(p(k+1)) - sqrt(p(k)), where p(k) denotes the k-th prime.at n=28A084977
• Expansion of 1/(1 - x^5 - x^6 - x^7 - x^8 + x^13).at n=57A173924
• a(1)=4, a(2)=5, a(n) = 4*a(n-1) + 5*a(n-2).at n=6A189744
• Antidiagonal sums of the convolution array A213783.at n=29A213760
• Number of cyclic subgroups of the group C_n x C_n x C_n x C_n, where C_n is the cyclic group of order n.at n=21A280184
• Expansion of 1/(1 - Sum_{k>=2} (1 - floor(2/d(k)))*x^k), where d(k) is the number of divisors (A000005).at n=46A280544
• Number of integer partitions whose sum of primes of parts equals their sum of parts plus n.at n=40A331387
• Numbers k such that the average of the squares of k consecutive primes starting with 7 is a prime.at n=8A359394
• 32-gonal numbers: a(n) = n*(15*n-14).at n=40A360436
• Differences between adjacent terms of A076467 that correspond to the locations of abc-quality records of A378164.at n=4A378165