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A173946
Numbers n such that omega(lambda(n)) = lambda(omega(n)).
1
1, 3, 4, 5, 6, 8, 10, 12, 15, 16, 17, 20, 24, 32, 34, 40, 42, 48, 51, 64, 66, 68, 70, 78, 80, 84, 85, 90, 96, 105, 110, 114, 126, 128, 130, 132, 136, 138, 140, 150, 156, 160, 165, 168, 174, 180, 182, 190, 192, 195, 210, 220, 222, 228, 230, 234, 238, 246
OFFSET
1,2
LINKS
FORMULA
Numbers n such that A001221 (A002322(n))=A002322(A001221 (n)).
EXAMPLE
174 is in the sequence because omega(lambda(174)) = omega(28) = 2 , lambda(omega(174))
= lambda(3) = 2.
MAPLE
with(numtheory): for n from 1 to 250 do:if nops(factorset(lambda(n)))= lambda(nops(factorset(n)))then printf(`%d, `, n):else fi:od:
MATHEMATICA
Cases[Range[1000], k_ /; Length[FactorInteger[CarmichaelLambda[k]]] == CarmichaelLambda[Length[FactorInteger [k]]]]
CROSSREFS
KEYWORD
nonn
AUTHOR
Michel Lagneau, Nov 26 2010
STATUS
approved