A281197 Least number m such that A247600(m) = n.

9, 7, 6, 998, 5, 6331, 15866, 39860, 100135, 251616, 636787, 1617099, 4124188, 10553076, 27066256, 69709243, 179992154, 465769460, 1208198239, 3140421185, 8179001679, 21338684878, 55762147707, 145935688930, 382465571795, 1003652346718

Offset: 5

Author

Seiichi Manyama, Jan 17 2017

Keywords

• nonn
• more

Examples

			pi(5*9) = 9 + 5.
pi(6*7) = 7 + 6.
pi(7*6) = 6 + 7.
pi(8*998) = 998 + 8.
pi(9*5) = 5 + 9.
...
pi(15*636787) = 636787 + 15.
pi(16*1617099) = 1617099 + 16.
		

Crossrefs

Cf. A000720, A247600.

Formula

pi(n*a(n)) = a(n) + n.

Extensions

a(19)-a(28) from Chai Wah Wu, May 03 2018

a(29)-a(30) from Chai Wah Wu, May 08 2018