Numbers n such that the heptagonal number H(n) is equal to the sum of the pentagonal numbers P(m) and P(m+1) for some m.
A252586
Numbers n such that the heptagonal number H(n) is equal to the sum of the pentagonal numbers P(m) and P(m+1) for some m.
Terms
- a(0) =4a(1) =257a(2) =1772a(3) =123729a(4) =853956a(5) =59636977a(6) =411604876a(7) =28744899041a(8) =198392696132
External references
- oeis: A252586