A076587 - OEIS

A076587

First occurrence of n as a term in the continued fraction for Pi/2.

1, 10, 4, 9, 20, 13, 26, 11, 142, 102, 70, 93, 179, 69, 127, 283, 52, 1166, 141, 605, 100, 83, 280, 414, 451, 61, 30, 234, 848, 448, 5, 372, 1389, 2445, 2082, 498, 603, 2565, 517, 3715, 22, 1155, 419, 856, 4125, 1573, 441, 207, 42, 1536, 5359, 576, 6654, 1002

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..54.

MATHEMATICA

Module[{nn=6700, p2}, p2=ContinuedFraction[Pi/2, nn]; Table[Position[p2, n, 1, 1], {n, 60}]]//Flatten (* Harvey P. Dale, Jul 14 2023 *)

PROG

(PARI) (15000 precision digits) v=contfrac(Pi/2); a(n)=if(n<0, 0, s=1; while(abs(n-component(v, s))>0, s++); s)

CROSSREFS

Cf. A032523.

Sequence in context: A309707 A376972 A100844 * A266999 A166204 A364190

Adjacent sequences: A076584 A076585 A076586 * A076588 A076589 A076590

KEYWORD

base,nonn

AUTHOR

Benoit Cloitre, Oct 20 2002

STATUS

approved