

A064051


a(n) = 2*prime(n)^2  prime(n+1)^2.


2



1, 7, 1, 23, 73, 49, 217, 193, 217, 721, 553, 1057, 1513, 1489, 1609, 2137, 3241, 2953, 3937, 4753, 4417, 5593, 5857, 6433, 8617, 9793, 9769, 11017, 10993, 9409, 15097, 15553, 18217, 16441, 21601, 20953, 22729, 25249, 25849, 27817, 31321, 29041, 35713
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OFFSET

1,2


COMMENTS

Theorem: a(n) > 0 for all n > 4.


REFERENCES

D. S. Mitrinovic et al., Handbook of Number Theory, Kluwer, 1996, Section VII.18, p. 247.


LINKS

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


MATHEMATICA

Table[2 Prime[n]^2  Prime[n+1]^2, {n, 45}] (* Vincenzo Librandi, Jun 22 2018 *)


PROG

(PARI) a(n) = 2*prime(n)^2  prime(n + 1)^2; \\ Harry J. Smith, Sep 06 2009
(MAGMA) [2*NthPrime(n)^2  NthPrime(n+1)^2: n in [1..45]]; // Vincenzo Librandi, Jun 22 2018


CROSSREFS

Cf. A324798.
Sequence in context: A261248 A214686 A211790 * A147385 A147347 A183109
Adjacent sequences: A064048 A064049 A064050 * A064052 A064053 A064054


KEYWORD

sign


AUTHOR

N. J. A. Sloane, Oct 15 2001


STATUS

approved



