A216536 - OEIS

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A216536

Numbers n such that the n-th Fibonacci number is prime, but cannot be written in the form a^2 + 7*b^2.

0

4, 5, 7, 11, 23, 43, 137, 359, 569, 571, 2971, 5387, 25561, 30757, 37511, 130021, 148091, 433781, 590041, 593689, 604711, 1049897, 1285607, 1636007

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

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..24.

Blair Kelly, Factorizations of Fibonacci and Lucas numbers

CROSSREFS

Cf. A000045, A001605.

Sequence in context: A062709 A242212 A129302 * A051658 A047491 A064401

Adjacent sequences: A216533 A216534 A216535 * A216537 A216538 A216539

KEYWORD

nonn

AUTHOR

V. Raman, Sep 08 2012

STATUS

approved