28675

Appears in sequences

• Triangle of Mahonian numbers T(n,k): coefficients in expansion of Product_{i=0..n-1} (1 + x + ... + x^i), where k ranges from 0 to A000217(n-1). Also enumerates permutations by their major index.at n=109A008302
• Triangle of Mahonian numbers T(n,k): coefficients in expansion of Product_{i=0..n-1} (1 + x + ... + x^i), where k ranges from 0 to A000217(n-1). Also enumerates permutations by their major index.at n=111A008302
• q-factorial numbers for q=-6.at n=4A015019
• Strong pseudoprimes to base 99.at n=23A020325
• a(n) = s(n+3)/6, where s is A024953.at n=12A024954
• Numbers n such that 261*2^n-1 is prime.at n=32A050889
• Partial sums of A034953(n).at n=23A085739
• 45-gonal numbers: n*(43*n-41)/2.at n=36A098924
• Numbers k such that k and k^2 use only the digits 2, 5, 6, 7 and 8.at n=29A137111
• Number of reduced words of length n in the Weyl group A_8.at n=17A161456
• Number of reduced words of length n in the Weyl group A_8.at n=19A161456
• a(n) = 7*2^n + 3.at n=12A164285
• S_11 sequence in partition of integers > 1 described in A240521.at n=12A241024
• Numbers n such that n^3 contains the consecutive substring 2,3,5,7.at n=28A295900
• A digitized pure tuning tone, sampled at standard settings for consumer audio: a(n) = floor(sin(2*Pi*(440/44100)*n)*32767).at n=17A320277
• a(n) = Sum_{-n<i<n, -n<j<n, gcd{i,j}=2} (n-|i|)*(n-|j|)/8.at n=34A331773
• Number of integer partitions of n whose rounded-down mean is 2.at n=47A363745
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where A(n,k) is the n-th q-factorial number for q=-k.at n=59A384454