a(n) = minimal m such that m>n, n divides m, n-1 divides m-1, n-2 divides m-2 and so on down to 1 divides m-n+1.

A060401

a(n) = minimal m such that m>n, n divides m, n-1 divides m-1, n-2 divides m-2 and so on down to 1 divides m-n+1.

Terms

    a(0) =2a(1) =4a(2) =9a(3) =16a(4) =65a(5) =66a(6) =427a(7) =848a(8) =2529a(9) =2530a(10) =27731a(11) =27732a(12) =360373a(13) =360374a(14) =360375a(15) =720736a(16) =12252257a(17) =12252258a(18) =232792579a(19) =232792580a(20) =232792581a(21) =232792582a(22) =5354228903a(23) =5354228904a(24) =26771144425a(25) =26771144426a(26) =80313433227a(27) =80313433228

External references