54615

Appears in sequences

• Number of (2,n)-partitions of a chain of length n^3.at n=6A055659
• Triangular numbers with sum of digits = 21.at n=32A068131
• Triangular numbers in which the k-th significant digit either divides k or is a multiple of k.at n=29A069559
• Numbers n such that A003313(3n) < A003313(n).at n=13A104699
• Triangular numbers whose digit reversal is the product of 2 palindromes greater than 1.at n=36A115702
• Numbers k such that A003313(k) = A003313(6*k).at n=13A116461
• Triangular numbers for which the sum of the digits is an octagonal number.at n=35A117523
• Inverse binomial transform of A140359.at n=16A140360
• Numbers n such that phi(n) = phi(n+7), with Euler's totient function phi = A000010.at n=30A179189
• Number of ways to choose two points on a centered hexagonal grid of size n.at n=10A241219
• Consider the group freely generated by an element U of order 3 and an element S of order 2. a(n) gives the number of words in the alphabet {U,S} of length n that are equal to unity.at n=21A265434
• Integers n such that n+2!, n+2!+3!, n+2!+3!+4!, n+2!+3!+4!+5!, n+2!+3!+4!+5!+6!, and n+2!+3!+4!+5!+6!+7! are all prime.at n=24A267123