20152

Appears in sequences

• Numbers n such that if p=prime(n), then p, p+6, p+12, p+18 are consecutive primes with p=6*k+5 for some k, where prime(n) denotes n-th prime.at n=33A090835
• "Correlation triangle" of central binomial coefficients A000984.at n=48A115255
• a(n) = 8 + floor((2 + Sum_{j=1..n-1} a(j))/4).at n=35A120166
• Sequence A154695 adjusted to leading one:t(n,m)=A154695(n,m)-A154695(n,0)+1.at n=17A174674
• Sequence A154695 adjusted to leading one:t(n,m)=A154695(n,m)-A154695(n,0)+1.at n=18A174674
• Number of arrangements of n+3 numbers in 0..5 with each number being the sum mod 6 of three others.at n=2A183888
• T(n,k)=Number of arrangements of n+3 numbers in 0..k with each number being the sum mod (k+1) of three others.at n=23A183892
• Number of (n+2) X 5 0..3 arrays with every 3 X 3 subblock commuting with each horizontal and vertical neighbor 3 X 3 subblock.at n=3A186875
• Number of (n+2) X 6 0..3 arrays with every 3 X 3 subblock commuting with each horizontal and vertical neighbor 3 X 3 subblock.at n=2A186876
• T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock.at n=17A186881
• T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock.at n=18A186881
• Positive integers whose square is the sum of 33 consecutive squares.at n=8A257767
• Number of ordered pairs (G,S), where G is a simple labeled graph on n nodes and S is a subset of the vertices of G, such that G[S], the subgraph of G induced by S, is connected.at n=5A281263
• Irregular table read by rows: T(n,k) is the number of k-gons, k>=2, in the Farey Ring graph FR(n) defined in A359116.at n=49A359119