A135725 -id:A135725 - cp's OEIS frontend

A155912 Let d(i) be the i-th digit of the decimal expansion of Pi = 3.1415926535897932384626433832795..., so that d(0) = 3, d(1) = 1, d(2) = 4, etc. Then a(0) = 3, a(n) = d(d(n)) for n>0.

3, 1, 5, 1, 9, 3, 4, 2, 9, 1, 9, 5, 3, 6, 3, 1, 4, 1, 5, 5, 2, 4, 2, 5, 1, 1, 5, 1, 4, 6, 3, 9, 3, 4, 5, 5, 5, 1, 3, 6, 1, 2, 3, 1, 3, 3, 1, 6, 9, 1, 3, 9, 5, 4, 3, 3, 6, 5, 3, 5, 5, 9, 3, 4, 1, 3, 6, 5, 1, 2, 5, 3, 2, 4, 5, 2, 4, 3, 5, 3, 3, 5, 2, 4, 5, 3, 1, 5, 5, 4, 9, 1, 5, 4, 1, 1, 6, 3, 2, 6, 3, 5, 4, 1, 5

Offset: 0

Dan Brown (ddbhockey(AT)hotmail.com), Jan 30 2009

This defines a constant 3.151934291953631... related to Pi in a peculiar way!

Zak Seidov, Table of n, a(n) for n = 0..999

Cf. A135725.

Cf. A119505. - Robert G. Wilson v, Mar 17 2009

id = Rest@ RealDigits[ Pi, 10, 105][[1]]; id[[0]] = 3; id[[ id[[ 0]]]] = 3; Table[id[[ id[[ n]]]], {n, 0, 104}] (* Robert G. Wilson v, Mar 17 2009 *)

Edited and extended by Zak Seidov and N. J. A. Sloane, Feb 10 2009

Sequence corrected by N. J. A. Sloane Aug 31 2009 using terms from the b-file

A156944 Let d(i) be the i-th digit of the decimal expansion of e = 2.71828182845..., so that d(1) = 2, d(2) = 7, d(3) = 1, etc. Then a(n) = d(10 - d(n)).

Original entry on oeis.org

8, 1, 2, 7, 8, 7, 2, 7, 8, 7, 8, 2, 2, 8, 8, 2, 8, 1, 2, 1, 8, 8, 8, 7, 1, 8, 1, 2, 1, 2, 8, 8, 8, 8, 8, 2, 1, 1, 2, 1, 8, 8, 1, 8, 2, 1, 8, 2, 2, 2, 2, 2, 2, 1, 8, 2, 8, 8, 2, 8, 1, 8, 8, 1, 1, 8, 8, 8, 1, 8, 8, 1, 8, 1, 2, 1, 2, 8, 1, 2, 2, 8, 2, 1, 2, 1, 7, 8, 2, 1, 7, 2, 8, 2, 2, 8, 8, 8, 8, 1, 8, 8, 1, 8, 8

Offset: 1

Zak Seidov, Feb 18 2009

Cf. A135725.

A157032 Let d(i) be the i-th digit of the decimal expansion of phi=1.6180339887498948482045868...,so that d(0) = 1, d(1) = 6, d(2) = 1, etc. Then a(0) = 1, thereafter a(n) = d(d(n)).

Original entry on oeis.org

1, 3, 6, 8, 1, 8, 8, 8, 8, 8, 9, 0, 8, 8, 8, 0, 8, 0, 8, 1, 1, 0, 3, 8, 3, 8, 8, 0, 8, 3, 3, 3, 8, 8, 6, 6, 9, 9, 1, 1, 8, 1, 8, 6, 9, 8, 8, 1, 3, 9, 3, 1, 8, 3, 1, 6, 8, 3, 0, 0, 8, 3, 1, 1, 9, 1, 3, 1, 3, 1, 0, 3, 1, 8, 6, 8, 8, 1, 1, 0, 0, 8, 9, 1, 9, 1, 1, 9, 1, 1, 0, 6, 8, 8, 8, 8, 6, 6, 8, 9, 0, 8, 0, 9, 3

Offset: 0

Dan Brown (ddbhockey(AT)hotmail.com), Feb 21 2009

This defines a constant 1.368188888908880808110383880... related to Phi in a peculiar way!

All digits are one of the first 10 digits of Phi = A001622, so 2, 4, 5 and 7 never appear. [From R. J. Mathar, Mar 14 2009]

Cf. A135725, A155912

More digits from R. J. Mathar, Mar 14 2009

cp's OEIS Frontend

A155912 Let d(i) be the i-th digit of the decimal expansion of Pi = 3.1415926535897932384626433832795..., so that d(0) = 3, d(1) = 1, d(2) = 4, etc. Then a(0) = 3, a(n) = d(d(n)) for n>0.

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A156944 Let d(i) be the i-th digit of the decimal expansion of e = 2.71828182845..., so that d(1) = 2, d(2) = 7, d(3) = 1, etc. Then a(n) = d(10 - d(n)).

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A157032 Let d(i) be the i-th digit of the decimal expansion of phi=1.6180339887498948482045868...,so that d(0) = 1, d(1) = 6, d(2) = 1, etc. Then a(0) = 1, thereafter a(n) = d(d(n)).

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