64701

Appears in sequences

• 4-dimensional pyramidal numbers: a(n) = (3*n+1)*binomial(n+2, 3)/4. Also Stirling2(n+2, n).at n=26A001296
• Expansion of 1/((1-5x)*(1-6x)*(1-7x)*(1-8x)).at n=4A028165
• Numbers n such that n = pi(n)*k + 1 for some k.at n=39A065136
• Polar structured meta-anti-diamond numbers, the n-th number from a polar structured n-gonal anti-diamond number sequence.at n=20A100188
• Numbers n such that there exists at least one number j and pi(m) = d_1 d_2 ... d_j*d_(j+1) d_(j+2) ... d_k where d_1 d_2 ...d_k is the decimal expansion of n.at n=35A112012
• Numbers k such that k^3 divides 17^(k^2) + 1.at n=30A177817
• 5-Stirling numbers of the second kind.at n=31A193685
• Pairs of deficient numbers having the same value of sigma(k)/k in the order that they are found.at n=39A211680
• The larger companion to the deficient numbers in A212608.at n=19A212609
• Number of n X 3 binary arrays whose sum with another n X 3 binary array containing no more than a single 1 has rows and columns in lexicographically nondecreasing order.at n=8A225895
• a(n) = n*(n+1)*(22*n-19)/6.at n=26A256716
• Expansion of (eta(q^6) * eta(q^10) / (eta(q) * eta(q^15)))^2 in powers of q.at n=24A263348
• Numbers n such that n^2 divides (17^n + 1).at n=19A292392
• Number of partitions of n with odd minimal and maximal parts.at n=47A325338
• Number triangle T associated with 2-Stirling numbers and Lehmer-Comtet numbers (see Comments and Formula section).at n=40A360657
• G.f. satisfies A(x) = 1 + x^3*A(x)^5*(1 + x*A(x)).at n=18A365726