1,3
Antti Karttunen, Table of n, a(n) for n = 1..10000
a(n) = A000005(A000203(A000010(n))) = A000005(A062402(n)) = A062068(A000010(n)).
(PARI) A151948(n) = numdiv(sigma(eulerphi(n))); \\ Antti Karttunen, Aug 22 2017
Cf. A000005, A000010, A000203, A062068, A062402, A163375.
Sequence in context: A164126 A261902 A163368 * A080400 A119462 A293221
Adjacent sequences: A151945 A151946 A151947 * A151949 A151950 A151951
nonn
Jaroslav Krizek, Jul 20 2009
approved