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A080680 Integer part of the square root of the n-th prime of the form 4k+1. 0
2, 3, 4, 5, 6, 6, 7, 7, 8, 9, 9, 10, 10, 10, 11, 12, 12, 13, 13, 13, 14, 15, 15, 15, 16, 16, 16, 16, 17, 17, 17, 18, 18, 18, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 22, 22, 23, 23, 23, 24, 24, 24, 24, 24, 25, 25, 25, 25, 26, 26, 26, 27, 27, 27, 27, 27, 28, 28, 28, 28, 29, 29, 29 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(n)^2 < A002330(n+2)^2 + A002331(n+2)^2 < a(n+1)^2.

LINKS

Table of n, a(n) for n=1..73.

FORMULA

a(n) = A000196(A002144(n)).

CROSSREFS

Sequence in context: A332061 A317442 A132172 * A005376 A196362 A195879

Adjacent sequences:  A080677 A080678 A080679 * A080681 A080682 A080683

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Mar 02 2003

STATUS

approved

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Last modified April 9 07:30 EDT 2020. Contains 333344 sequences. (Running on oeis4.)