A062732 - OEIS

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A062732

Squares arising in A039770.

1, 1, 4, 4, 4, 4, 16, 16, 16, 36, 16, 16, 36, 16, 36, 36, 36, 64, 100, 36, 36, 100, 36, 64, 64, 64, 64, 144, 64, 196, 100, 64, 144, 64, 100, 256, 144, 144, 144, 144, 144, 144, 144, 144, 144, 196, 400, 144, 144, 144, 400, 144, 144, 324, 144, 400, 256, 324, 256, 144

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

REFERENCES

D. M. Burton, Elementary Number Theory, Allyn and Bacon Inc., Boston MA, 1976, p. 141.

LINKS

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

PROG

(PARI) je=[]; for(n=1, 1000, if(issquare(eulerphi(n)), je=concat(je, eulerphi(n)))); je

(PARI) n=0; for (m=1, 10^5, if (issquare(a=eulerphi(m)), write("b062732.txt", n++, " ", a); if (n==1000, break))) \\ Harry J. Smith, Aug 10 2009

CROSSREFS

Cf. A039770.