245520

Appears in sequences

• a(n) = n*(n+1)*(n+2)*(n+3)/4.at n=30A033487
• Numbers m such that N = (am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,67.at n=6A065701
• Numbers that can be expressed as the difference of the squares of primes in exactly nine distinct ways.at n=30A092005
• Sigma(A033631(n)) {sigma is the sum of divisors function A000203}.at n=27A115619
• Sums of adjacent amicable numbers, a(n) = A063990(2n-1) + A063990(2n).at n=14A161005
• The sum of the two numbers in an amicable pair, A002025(n) + A002046(n).at n=15A180164
• The sum (in nondecreasing order) of the two numbers in an amicable pair.at n=14A259953
• Numbers k such that sqrt(k + sqrt(k + sqrt(k + ...))) is an even perfect number.at n=2A261030
• Number of minimum dominating sets in the n X n black bishop graph.at n=12A323500
• a(n) is the least x such that x-1 and x+1 are prime and there are exactly n primes of the form x-1+t or x+1+t where t divides x.at n=45A340170
• a(n) = n*(2^(n-1) - n - 1).at n=12A342482
• Number of n-digit numbers in which more than half of the digits are the same.at n=6A353182
• Oblong numbers that are products of smaller oblong numbers.at n=34A374374
• Expansion of 1/(1 - 4*x^2 - 4*x^3)^(3/2).at n=14A377186