87153

Appears in sequences

• Icosahedral numbers: a(n) = n*(5*n^2 - 5*n + 2)/2.at n=32A006564
• Number of forests of rooted trees of nonempty sets with n points. (Each node is a set of 1 or more points.)at n=11A052855
• Terms of A073872 that do not change their position in the rearrangement; i.e., values of A073872(n) which equal n(n+1)/2.at n=33A073873
• Concatenation of triangular number k and its 10's complement is prime.at n=23A108970
• A Jacobsthal convolution.at n=18A113726
• Triangular numbers which are an average of four consecutive primes.at n=37A226196
• Maximum water retention of a number octagon of order n.at n=8A260302
• Numbers that are both triangular and icosahedral.at n=3A307174
• Number of inversion sequences of length n where all consecutive subsequences i,j,k satisfy i > j < k or i < j > k.at n=11A326308
• Hexagonal numbers that are products of exactly four distinct primes.at n=37A381920