OFFSET

1,2

EXAMPLE

a(1) = 0 since 2, 4, 6, and 8 are terms of A002202.

a(2) = 13 since there are 13 even nontotients less than 100, and they are 14,26,34,38,50,62,68,74,76,86,90,94 and 98.

PROG

(PARI) a(n)=sum(k=1, 10^n\2, !istotient(2*k)) \\ Charles R Greathouse IV, Apr 25 2023

CROSSREFS

KEYWORD

nonn,more

AUTHOR

Robert G. Wilson v, Apr 24 2023

EXTENSIONS

a(8)-a(10) from Charles R Greathouse IV, Apr 25 2023

STATUS

approved