118341

Appears in sequences

• Numbers k that divide s(k), where s(1)=1, s(j)=19*s(j-1)+j.at n=38A014869
• Numbers k such that k | 11^k + 1.at n=33A015960
• Triangular numbers in which the k-th significant digit either divides k or is a multiple of k.at n=33A069559
• a(n) = A026905(n) - A014284(n).at n=36A086741
• Concatenation of triangular number k and its 10's complement is prime.at n=27A108970
• Triangular numbers of the form p*w, where p is a prime number and w is a prime power (A025475).at n=20A225674
• Numbers k>1 such that 10^phi(k) == 1 (mod k^2), where phi(n)=A000010(n).at n=6A241977
• a(n) = Sum_{d|n} max(d, n/d)^5.at n=8A297844
• a(n) = [x^n] Product_{k>=1} (1 + 3^n*x^k).at n=5A318246
• "Primitive" numbers k such that k divides 4^k - 1.at n=35A323203
• Number of nonisomorphic spanning trees of the triangular snake nC_3.at n=11A374721