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A067757 Numbers k whose last digit is the k-th digit of sqrt(2). 3
15, 18, 20, 21, 39, 45, 47, 49, 67, 87, 92, 117, 122, 126, 147, 149, 162, 165, 170, 179, 192, 197, 205, 235, 237, 264, 272, 274, 275, 279, 282, 286, 289, 292, 297, 305, 313, 318, 335, 340, 344, 345, 356, 381, 384, 394, 403, 409, 418, 433, 446, 449, 471, 476 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Chai Wah Wu, Table of n, a(n) for n = 1..10000

EXAMPLE

Let d(n) be the n-th digit of sqrt(2)=1.4142... so d(1)=4, d(2)=1 etc. d(122)=2 and 2 is the last digit of 122 hence 122 is in the sequence.

PROG

(Python 3.8+)

from math import isqrt

A067757_list = [i for i, d in enumerate(str(isqrt(2*100**100000))) if i % 10 == int(d)] # Chai Wah Wu, Jul 08 2021

CROSSREFS

Cf. A002193, A067750, A067789.

Sequence in context: A159840 A124609 A102500 * A063779 A063781 A125006

Adjacent sequences:  A067754 A067755 A067756 * A067758 A067759 A067760

KEYWORD

easy,nonn,base

AUTHOR

Benoit Cloitre, Mar 07 2002

STATUS

approved

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Last modified October 21 13:44 EDT 2021. Contains 348155 sequences. (Running on oeis4.)