A023420 - OEIS

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A023420

a(n) = c([ n/2 ]) + c([ n/3 ]) + ... + c([ n/n ]) for n >=3, where a(1) = 1, a(2) = 3 and c(n) = n-th number not in sequence a( ).

1, 3, 4, 9, 11, 17, 19, 25, 28, 34, 36, 45, 47, 54, 58, 65, 67, 76, 78, 86, 91, 97, 99, 111, 114, 121, 125, 134, 136, 147, 149, 157, 161, 167, 172, 186, 188, 194, 199, 210, 212, 224, 226, 234, 240, 246, 248, 262, 266, 275, 279, 289, 291, 303, 307

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Table of n, a(n) for n=1..55.

CROSSREFS

Sequence in context: A321871 A050006 A176744 * A004657 A054075 A366753

Adjacent sequences: A023417 A023418 A023419 * A023421 A023422 A023423

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved