79445

Appears in sequences

• Numbers n such that 3*10^n + 2*R_n + 7 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=17A102968
• a(1)=1, a(n) = a(n-1) + n^5 if n odd, a(n) = a(n-1) + n^2 if n is even.at n=9A135095
• Positive integers that cannot be written as a sum of a practical number and a heptagonal number.at n=72A373444