93799

Appears in sequences

• Heptagonal numbers with only odd digits.at n=11A117993
• E.g.f.: A(x) = (exp(x)/(4 - 3*exp(x)))^(1/4).at n=6A136728
• Numbers k such that k-1 and k+1 are each the product of exactly 7 primes, counted with multiplicity.at n=29A157487
• Heptagonal numbers (A000566) that are semiprimes (A001358).at n=29A259676
• Irregular table read by rows: n-th row lists the 9 n-gonal numbers of a 3 X 3 semimagic square with the smallest magic sum. The terms of each row are arranged in the manner shown in A261816.at n=37A265141
• Array read by downward antidiagonals: A(n,k) = Sum_{j=0..k+1} binomial(k+2, j+1)*A(n-1,j) with A(0,k) = 1, n >= 0, k >= 0.at n=39A370381