70500

Appears in sequences

• a(n) = floor( n*(n-1)*(n-2)*(n-3)/28 ).at n=39A011938
• Number of lines through exactly 3 points of an n X n grid of points.at n=40A018810
• 2nd elementary symmetric function of the first n+1 positive integers congruent to 2 mod 3.at n=14A024391
• Numbers k such that 9*10^k+1 is prime.at n=17A056797
• a(1) = 1; a(n) is the smallest triangular number > a(n-1) which differs from it at every digit.at n=34A068855
• Triangular numbers which are 7-almost primes.at n=24A076581
• Triangular numbers for which the sum of the digits is a pentagonal number.at n=30A117305
• Triangular numbers composed of digits {0,5,7}.at n=3A119081
• Number of 5-alternating permutations.at n=13A181936
• Number of length-n restricted growth strings (RGS) with growth <= ten and first element in [10].at n=4A306034
• Irregular triangle read by rows: T(n,k) = number of homeomorphically irreducible connected labeled graphs with n vertices and k edges, n >= 1, 0 <= k <= n*(n-1)/2.at n=55A331438
• Numbers m such that for some number k dividing n, m is formed by inserting a digit 0 between each pair of digits of k.at n=35A343552
• Positive triangular numbers such that the two numbers before it and the two numbers after it are squarefree.at n=44A374503
• Number of nonisomorphic spanning trees of the nC_5-snake with constant distance between cutpoints.at n=7A374722