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A128050 Position of start of first occurrence of prime(n) after the decimal point in expansion of golden ratio phi. 1

%I

%S 19,5,22,10,34,55,35,188,131,174,137,98,90,27,102,111,166,1,150,217,

%T 479,44,25,13,81,458,1242,744,563,96,1602,186,97,995,259,939,1999,

%U 1204,641,1191,43,833,1682,2833,2708,188,647,130,62,734,2337,1106,307,1156,2532

%N Position of start of first occurrence of prime(n) after the decimal point in expansion of golden ratio phi.

%e Golden ratio phi = 1.6180339887498948482045868343656381177... (see A001622).

%e First occurrence of prime(1) = 2 is at the 19th digit after the decimal point, hence a(1) = 19.

%e First occurrence of prime(5) = 11 starts at the 34th digit after the decimal point, hence a(5) = 34.

%o (MAGMA) k:=3000; R := RealField(k); [ Position(IntegerToString(Round(10^k*(-1 + (Sqrt(elt<R | 5, 0>)+1) / elt<R | 2, 0>))), IntegerToString(NthPrime(n))) : n in [1..55] ]; /* Klaus Brockhaus, Feb 15 2007 */

%Y Cf. A001622, A037024, A014777.

%K base,nonn

%O 1,1

%A _Gregory Allen_, Feb 13 2007

%E Edited, corrected and extended by _Klaus Brockhaus_, Feb 15 2007

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Last modified June 18 14:47 EDT 2021. Contains 345114 sequences. (Running on oeis4.)