36121

Appears in sequences

• Fibonacci sequence beginning 1, 22.at n=17A022392
• a(n) = a(n-1) + 20*a(n-2), n >= 2; a(0)=1, a(1)=1.at n=7A053428
• a(n) = n*(n^2 + 2*n - 1)/2.at n=40A127736
• Wiener index of the prism graph Y_n on 2n nodes.at n=40A138179
• A symmetrical triangle sequence: t(n,m)=n!*Eulerian[n + 1, m] - n! + 1.at n=17A174691
• A symmetrical triangle sequence: t(n,m)=n!*Eulerian[n + 1, m] - n! + 1.at n=18A174691
• Numbers k for which 10k + 1, 10k + 3, 10k + 7, 10k + 9 and 10k + 13 are primes.at n=19A178084
• Wiener index of the Moebius ladder M(n).at n=40A180857
• Centered 40-gonal numbers.at n=42A195317
• Right edge of the triangle A045975.at n=40A204557
• Composite numbers whose Euler totient divides the sum of the Euler totients of the numbers less than or equal to n and not relatively prime to n.at n=9A249397
• Number of (n+1) X (2+1) arrays of permutations of 0..n*3+2 with each element having directed index change -1,1 -1,2 1,0 or 0,-1.at n=14A264544
• Number of minimum edge covers in the n-dipyramidal graph.at n=40A298822
• Numbers k of the form (x + y)*(x^2 + y^2) such that (x + y) and (x^2 + y^2) are primes.at n=40A349202