A116920 a(0)=1. a(n) = A020639(a(n-1)) + n.

1, 2, 4, 5, 9, 8, 8, 9, 11, 20, 12, 13, 25, 18, 16, 17, 33, 20, 20, 21, 23, 44, 24, 25, 29, 54, 28, 29, 57, 32, 32, 33, 35, 38, 36, 37, 73, 110, 40, 41, 81, 44, 44, 45, 47, 92, 48, 49, 55, 54, 52, 53, 105, 56, 56, 57, 59, 116, 60, 61, 121, 72, 64, 65, 69, 68, 68, 69, 71, 140, 72

Offset

0,2

Links

Robert Israel, Table of n, a(n) for n = 0..10000

Maple

lpf:= proc(n) min(numtheory:-factorset(n)) end proc: lpf(1):= 1:
A:= Array(0..100): A[0]:= 1:
for n from 1 to 100 do A[n]:= lpf(A[n-1])+n od:
convert(A, list); # Robert Israel, Nov 26 2020

Mathematica

a[0] := 1; a[1] := 2; a[n_] := FactorInteger[a[n - 1]][[1]][[1]] + n; Table[a[n], {n, 0, 80}] (* Stefan Steinerberger, Mar 27 2006 *)

Crossrefs

Cf. A020639, A116919.

Sequence in context: A276163 A011341 A116477 * A116919 A270429 A359878

Adjacent sequences: A116917 A116918 A116919 * A116921 A116922 A116923

Keyword

nonn,look

Author

Leroy Quet, Feb 26 2006

Extensions

More terms from Stefan Steinerberger, Mar 27 2006

Status

approved