

A062948


H(A002808(n)) where H(n) is the halftotient function, H(n)=phi(n)/2:(A023022) and A002808(n) are the composites.


1



1, 1, 2, 3, 2, 2, 3, 4, 4, 3, 4, 6, 5, 4, 10, 6, 9, 6, 4, 8, 10, 8, 12, 6, 9, 12, 8, 6, 10, 12, 11, 8, 21, 10, 16, 12, 9, 20, 12, 18, 14, 8, 15, 18, 16, 24, 10, 16, 22, 12, 12, 18, 20, 18, 30, 12, 16, 27, 20, 12, 32, 21, 28, 20, 12, 36, 22, 30, 23, 36, 16, 21, 30, 20, 16, 24, 24, 26
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OFFSET

1,3


LINKS

Harry J. Smith, Table of n, a(n) for n=1,...,1000


PROG

(PARI) H(n)=eulerphi(n)/2; j=[]; for(n=2, 200, if(isprime(n), n+1, j=concat(j, H(n) ))); j
(PARI) { n=0; for (m=2, 10^9, if (!isprime(m), write("b062948.txt", n++, " ", eulerphi(m)/2); if (n==1000, break)) ) } [From Harry J. Smith, Aug 14 2009]


CROSSREFS

Cf. A023022, A002808.
Sequence in context: A104377 A109337 A137266 * A096258 A049879 A053812
Adjacent sequences: A062945 A062946 A062947 * A062949 A062950 A062951


KEYWORD

easy,nonn


AUTHOR

Jason Earls (zevi_35711(AT)yahoo.com), Jul 21 2001


EXTENSIONS

OFFSET changed from 2,3 to 1,3 by Harry J. Smith, Aug 14 2009


STATUS

approved



