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A064936 Primes p such that GCD(p, prime(p)^2 - 1) does not equal 1. 0
2, 3, 5, 181, 40087, 251737 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

No further terms up to 41161739. [From Harvey P. Dale, Dec 23 2011]

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

5 belongs in the sequence because GCD( 5, P_5^2 -1) = GCD( 5, 120) = 5.

MATHEMATICA

Do[ If[ GCD[ Prime[n], Prime[ Prime[n]]^2 - 1] != 1, Print[ Prime[n]] ], {n, 1, 10^6} ]

CROSSREFS

Cf. A064830.

Sequence in context: A325505 A319609 A140551 * A041655 A082520 A062597

Adjacent sequences:  A064933 A064934 A064935 * A064937 A064938 A064939

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Oct 26 2001

STATUS

approved

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Last modified October 18 08:08 EDT 2019. Contains 328146 sequences. (Running on oeis4.)