195195

Appears in sequences

• (nextprime(5^n)-nextprime(2^n))/2.at n=8A037133
• Boundaries of primorial intervals [1,3]; [3,9],[9,15]; [15,45], etc.at n=23A065917
• Odd unitary abundant numbers that are not odd, squarefree, ordinary abundant numbers.at n=0A129486
• Numbers with exactly 5 distinct odd prime divisors {3,5,7,11,13}.at n=6A147578
• Triangle read by rows: T(n,k) is the number of end rhyme patterns of a poem of an even number of lines (2n) with 1<=k<=n evenly rhymed sounds.at n=23A156289
• Rectified heptapeton (6-simplex) numbers: the coefficient of x^(2n-2) in (1+x+x^2+...+x^(n-1))^7.at n=11A179097
• Numbers k such that the sum of the distinct prime divisors of k equals three times the largest prime divisor of k.at n=17A200090
• a(0)=1, and for n >= 1, a(n) = p_n * A002110(n) / 2, where p_n is the n-th prime.at n=6A243054
• Self-inverse permutation of nonnegative integers, A075158-conjugate of the inverse of gray code: a(n) = 1 + A075157(A006068(A075158(n-1))).at n=30A245452
• Number of set partitions of [n] into exactly nine blocks where sizes of distinct blocks are coprime.at n=5A280887
• Odd numbers k such that k is a multiple of A243071(k).at n=6A364965
• Odd abundant numbers that are also doublets (cf. A020338).at n=6A380232
• a(n) = Sum_{k=0..floor(2*n/5)} binomial(k+2,2) * binomial(k,2*n-5*k).at n=37A392270