30865

Appears in sequences

• Number of compositions of n in which the smallest part is equal to the number of parts.at n=50A098133
• a(n)= 5*a(n-1) -a(n-2) -a(n-3).at n=9A108143
• Numbers k such that (19*10^k - 61)/3 is prime.at n=22A285939
• Numbers k such that (418*10^k + 23)/9 is prime.at n=20A291710
• Least number that reaches 1 after n iterations of the infinitary totient function A091732.at n=16A333610
• Least positive integer m relatively prime to n such that sigma(m*n) is a fourth power, where sigma(k) is the sum of the divisors of k.at n=43A334353
• Positive numbers k such that the centered cube number k^3 + (k+1)^3 is equal to the difference of two positive cubes and to A352759(n).at n=9A355751
• Number of twice-partitions of n into distinct strict partitions.at n=24A358914