72618

Appears in sequences

• Triangle read by rows: T(k,s) = binomial(k+s,2s+1)*(2k-1)*(2k+1)/(2s+3), k >= 1, 0 <= s <= k-1.at n=49A111126
• Triangle read by rows: T(k,s)=(2k-1)(2k+1)binomial(2k-s-1,2k-2s-1)/(2k-2s+1); k>=1, 0<=s<=k-1.at n=50A111127
• Numbers k such that k*sigma(k)*sigma(sigma(k)) is a square.at n=8A116004
• Sum of staircase twin primes according to the rule: top * bottom - next top.at n=17A135285
• First occurrence of n consecutive n's in the decimal expansion of the golden ratio.at n=4A224844
• a(n) is the smallest number that has exactly n odious divisors (A000069).at n=33A355968