A278029 - OEIS

A278029

a(1) = 0; for n > 1, a(n) = k if n is a non-perfect-power, A007916(k); or 0 if n is a perfect power.

0, 1, 2, 0, 3, 4, 5, 0, 0, 6, 7, 8, 9, 10, 11, 0, 12, 13, 14, 15, 16, 17, 18, 19, 0, 20, 0, 21, 22, 23, 24, 0, 25, 26, 27, 0, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 0, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 0, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 0

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

OFFSET

1,3

LINKS

Rémy Sigrist, Table of n, a(n) for n = 1..10000

N. J. A. Sloane, Maple programs for A007916, A278028, A278029, A052409, A089723, A277564

MATHEMATICA

FoldList[Boole[#2 != #1] #2 &, #] &@ Accumulate@ Array[Boole[And[# > 1, CoprimeQ @@ FactorInteger[#][[All, -1]]]] &, 81] (* Michael De Vlieger, Dec 18 2016 *)

CROSSREFS

Cf. A007916, A072813, A289023.

Sequence in context: A306765 A087819 A290820 * A338572 A066246 A198370

Adjacent sequences: A278026 A278027 A278028 * A278030 A278031 A278032

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Nov 10 2016

EXTENSIONS

Name corrected by Peter Munn, Feb 28 2024

STATUS

approved