23620

Appears in sequences

• a(n)^2 is the least square base-n doublet (base-n representation is the concatenation of 2 identical strings).at n=7A020339
• Numbers equal to a permutation (or rearrangement) of the digits of the sum of their proper divisors (excluding the proper divisor 1). Rearrangements which cause leading zeros are excluded.at n=13A086248
• Number of n-digit prime quadruplets.at n=7A120120
• Numbers k such that 3^k mod k = 3^k mod k^2.at n=26A125774
• Numbers k such that k^2 divides 3^k-1.at n=10A127103
• Number of nondecreasing strings of numbers x(i=1..6) in -n..n with sum x(i)^3 equal to 0.at n=42A188280
• a(n) = Sum_{y=1..n} Sum_{x=1..n} floor((x^k + y^k)^(1/k)) with k = 3.at n=31A211792
• Triangle read by rows: T(n,k) = 4*T(n-1,k-1) + T(n,k-1) with T(2*m,0) = 0 and T(2*m+1,0) = 5^m.at n=41A292466
• a(n) is the nearest integer to the area of a triangle with sides prime(n), prime(n+1), prime(n+2).at n=49A338267
• Total number of 1's in the binary expansion of parts in all partitions of n into distinct parts.at n=46A347060