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A106840 Numbers n such that both n and n+1 have odd part of form 4k+1. 2
1, 4, 8, 9, 16, 17, 20, 25, 32, 33, 36, 40, 41, 49, 52, 57, 64, 65, 68, 72, 73, 80, 81, 84, 89, 97, 100, 104, 105, 113, 116, 121, 128, 129, 132, 136, 137, 144, 145, 148, 153, 160, 161, 164, 168, 169, 177, 180, 185, 193, 196, 200, 201, 208, 209, 212, 217, 225 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..58.

EXAMPLE

20/4=5 is 1 mod 4 and so is 21, therefore 20 is in sequence.

CROSSREFS

Cf. A091072, A106841, A106837.

Contains A106841 and A106841+1.

Sequence in context: A004756 A237882 A153034 * A242663 A140612 A160053

Adjacent sequences:  A106837 A106838 A106839 * A106841 A106842 A106843

KEYWORD

nonn

AUTHOR

Ralf Stephan, May 03 2005

STATUS

approved

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Last modified June 19 00:55 EDT 2019. Contains 324217 sequences. (Running on oeis4.)