18492

Appears in sequences

• Number of points on surface of cuboctahedron (or icosahedron): a(0) = 1; for n > 0, a(n) = 10n^2 + 2. Also coordination sequence for f.c.c. or A_3 or D_3 lattice.at n=43A005901
• 11-gonal (or hendecagonal) pyramidal numbers: a(n) = n*(n+1)*(3*n-2)/2.at n=23A007586
• Numbers k such that k | sigma_11(k).at n=34A055715
• Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 7 (most significant digit on right).at n=13A061936
• G.f.: (1+x)/Product_{m>0} (1 - x^m).at n=33A084376
• 75-gonal numbers: a(n) = n*(73*n-71)/2.at n=23A098230
• a(n) = 16*n^2 - 4.at n=33A158443
• Integers n such that either 2^n * prime(n) + 3 or 2^n * prime(n) - 3 is prime.at n=55A265126
• Numbers k such that 4*10^k + 79 is prime.at n=22A281645
• Number of n X 6 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.at n=4A302079
• T(n,k) = Number of n X k 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.at n=49A302081
• Number of 5 X n 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.at n=5A302084
• Records of A058249: (Smallest prime >= 2^n) - (largest prime <= 2^n).at n=39A331620