40530

Appears in sequences

• Smallest number m such that m = p(i) mod p(i)^2 for 1<=i<=n.at n=3A071056
• Sums of terms of groups in A075626.at n=41A075629
• Triangle T(n, k) = (f(n, 1 + (n mod 3)) + f(k, 1 + (k mod 3))) mod n!, read by rows (see formula for f(n, k)).at n=63A117754
• Wiener index of the n-sunlet graph.at n=39A180574
• Numbers n for which 2 < A257993(A276086(A276086(n))) < A257993(n), where A276086 converts the primorial base expansion of n into its prime product form, and A257993 returns the index of the least prime not present in its argument.at n=27A328762
• Gaps between first elements of prime quintuples of the form (p, p+2, p+6, p+12, p+14). The quintuples are abutting: twin/cousin/sexy/twin pairs.at n=37A342502
• a(n) = Sum_{k=0..n} (-1)^k * binomial(n+4*k+4,n-k) * Catalan(k).at n=13A360060
• The smallest composite number k that shares exactly n distinct prime factors with sopfr(k), the sum of the primes dividing k, with repetition.at n=4A372524
• Products of 5 distinct primes that are sandwiched between twin prime numbers.at n=26A376380
• a(n) = [(x*y)^n] Product_{k>=1} 1 / (1 - x^k - y^k)^k.at n=7A382947