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A106577 Indices n of perfect squares n^2 which are both the sum and the difference of two primes. 12
2, 3, 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 26, 28, 30, 32, 33, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100, 102, 104, 106, 108, 110, 112, 114, 116, 117, 118, 120, 122 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..67.

FORMULA

a(n) = SQRT(A106575(n)).

EXAMPLE

a(3)=4 because the third square which is the sum and the difference of two primes (16=4^2) is the 4th one in

the succession of the perfect squares (thus: index 4).

CROSSREFS

Cf. A106544-A106548, A106562-A106564, A106571, A106573-A106575.

Sequence in context: A047229 A094229 A067290 * A068577 A225731 A246352

Adjacent sequences:  A106574 A106575 A106576 * A106578 A106579 A106580

KEYWORD

easy,nonn

AUTHOR

Alexandre Wajnberg, May 09 2005

EXTENSIONS

Extended by Ray Chandler, May 12 2005

STATUS

approved

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Last modified November 22 13:47 EST 2019. Contains 329393 sequences. (Running on oeis4.)