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A110284 Squares of the form 4p - 3, where p is a prime. 7
9, 25, 49, 121, 169, 289, 625, 841, 961, 1225, 1681, 1849, 2401, 3025, 4489, 5929, 6889, 10201, 11881, 13225, 14161, 15625, 17689, 19321, 20449, 22801, 24025, 24649, 25921, 32041, 32761, 39601, 41209, 44521, 48841, 49729, 55225, 57121, 69169 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Also: squares of the form 2*s-3, where s is a semiprime, A107317. - Franklin T. Adams-Watters, Jun 28 2010

LINKS

Table of n, a(n) for n=1..39.

FORMULA

a(n) = 4*A002383(n) - 3 = A088503(n-1)^2.

MATHEMATICA

Select[ 4Prime[ Range[2000]] - 3, IntegerQ[ Sqrt[ # ]] &] (* Robert G. Wilson v, Sep 20 2005 *)

CROSSREFS

Cf. A002383, A002384, A088503, A001358.

Sequence in context: A246331 A141768 A176970 * A109367 A110588 A038771

Adjacent sequences:  A110281 A110282 A110283 * A110285 A110286 A110287

KEYWORD

nonn

AUTHOR

Giovanni Teofilatto, Sep 07 2005

EXTENSIONS

Extended by Ray Chandler, Sep 07 2005

STATUS

approved

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Last modified March 29 07:21 EDT 2017. Contains 284250 sequences.