A274118 (1+e)-sigma betrothed numbers.
108, 140, 195, 1050, 1925, 8892, 16587, 312620, 549219, 587460, 1057595, 1279950, 2576945, 5088650, 6446325, 7460004, 7875450, 10925915, 13922100, 16381925, 22559060, 26502315, 29864120, 30809415, 31213899, 41137620, 84854315, 89446860, 102019644, 114859884
Offset: 1
Keywords
Examples
(1+e)-sigma(140) - 140 - 1 = 336 - 140 - 1 = 195 and (1+e)-sigma(195) - 195 - 1 = 336 - 195 - 1 = 140.
Links
- Paolo P. Lava, Table of n, a(n) for n = 1..50
Programs
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Maple
with(numtheory): T:=proc(n) local a,d,p,e,s,sp; a:=1; for d in ifactors(n)[2] do p:=op(1,d); e:= op(2,d); sp:=1; for s in divisors(e) do sp:=sp+p^s; od: a:=a*sp; od: a; end: P:=proc(q) local n,x,y; for n from 2 to q do x:=T(n)-n-1; y:=T(x)-x-1; if n=y then print(n); fi; od; end: P(10^10);
Comments