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A354110 The 2-adic valuation of phi(A267099(n)), where A267099 is fully multiplicative involution swapping the positions of 4k+1 and 4k+3 primes, and phi is Euler totient function. 1
0, 0, 2, 1, 1, 2, 2, 2, 2, 1, 4, 3, 1, 2, 3, 3, 1, 2, 2, 2, 4, 4, 2, 4, 1, 1, 2, 3, 1, 3, 3, 4, 6, 1, 3, 3, 1, 2, 3, 3, 1, 4, 2, 5, 3, 2, 2, 5, 2, 1, 3, 2, 1, 2, 5, 4, 4, 1, 3, 4, 1, 3, 4, 5, 2, 6, 3, 2, 4, 3, 5, 4, 1, 1, 3, 3, 6, 3, 2, 4, 2, 1, 2, 5, 2, 2, 3, 6, 1, 3, 3, 3, 5, 2, 3, 6, 1, 2, 6, 2, 1, 3, 4, 3, 5 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..100000

FORMULA

a(n) = A007814(A354102(n)) = A053574(A267099(n)).

PROG

(PARI)

\\ Uses also the program from A267099:

A354102(n) = eulerphi(A267099(n));

A354110(n) = valuation(A354102(n), 2);

CROSSREFS

Cf. A000010, A007814, A053574, A267099, A354102, A354107.

Sequence in context: A067390 A256945 A282091 * A015718 A008350 A019556

Adjacent sequences:  A354107 A354108 A354109 * A354111 A354112 A354113

KEYWORD

nonn

AUTHOR

Antti Karttunen, May 20 2022

STATUS

approved

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Last modified September 27 22:01 EDT 2022. Contains 357063 sequences. (Running on oeis4.)