29953

Appears in sequences

• Number of atoms in a decahedron with n shells.at n=33A004068
• Concatenations C1 and C2 and C3 and C4 are all prime (see the comment lines).at n=10A034819
• a(n) = T(n,n+2), array T as in A050143.at n=7A050151
• Composite numbers m such that phi(m)*sigma(m) is divisible by m-1.at n=35A065149
• Average of three successive primes squared, (prime(n)^2+prime(n+1)^2+prime(n+2)^2)/3, n>=3.at n=36A075893
• Pell pseudoprimes: odd composite numbers n such that P(n)-Kronecker(2,n) is divisible by n.at n=32A099011
• a(n) = n^2*(n^6 + 28*n^4 + 154*n^2 + 132)/315.at n=7A099195
• a(n) = 9973*n + 10007.at n=2A101442
• Numbers k such that phi(k)*k is a triangular number.at n=13A115910
• Gaussian column reduction of Hankel matrix for central Delannoy numbers.at n=29A118384
• a(n) = 52*n^2 + 1.at n=24A158644
• Partial sums of A002106.at n=23A173407
• Triangle, read by rows of 2*n+1 terms, where row n lists the coefficients in (1+3*x+2*x^2)^n.at n=55A200536
• Number of (w,x,y,z) with all terms in {1,...,n} and |w-x|=|x-y|+|y-z|.at n=33A212570
• Crystal ball sequence for the lattice C_8.at n=3A305722
• Number of subsets of {1,...,n + 1} containing n + 1 and such that all positive differences of distinct elements are distinct.at n=30A308251
• Triangle read by rows: T(0,0) = 1; T(n,k) = 2 T(n-1,k) - 3 T(n-1,k-1) + T(n-1,k-2) for k = 0..2n; T(n,k)=0 for n or k < 0.at n=57A318685
• Composite numbers k such that Pell(k) == 1 (mod k).at n=35A319042
• Intersection of A099011 and A327651.at n=18A327652
• NSW pseudoprimes: odd composite numbers k such that A002315((k-1)/2) == 1 (mod k).at n=22A330276