250927

Appears in sequences

• Let p = n-th irregular prime, A000928(n). Then a(n) = smallest value of m such that numerator(Bernoulli(2*m)/(2*m)) / numerator(Bernoulli(2*m)/(2*m*(2*m-1))) equals p.at n=64A092291
• a(n) is the smallest number writable in n different ways as the sum of two distinct nonzero pentagonal numbers.at n=5A332989