A177979 - OEIS

A177979

Smallest number k such that A002313(n) divides k^2+1.

1, 2, 5, 4, 12, 6, 9, 23, 11, 27, 34, 22, 10, 33, 15, 37, 44, 28, 80, 19, 81, 14, 107, 89, 64, 16, 82, 60, 53, 138, 25, 114, 148, 136, 42, 104, 115, 63, 20, 143, 29, 179, 67, 109, 48, 208, 235, 52, 118, 86, 24, 77, 125, 35, 194, 154, 149, 106, 58, 26, 135, 96, 353, 87, 39

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OFFSET

1,2

COMMENTS

1 followed by A002314. [From R. J. Mathar, May 29 2010]

REFERENCES

Friedhelm Padberg: Elementare Zahlentheorie. Spektrum Akademischer Verlag, Berlin Heidelberg, 1996

LINKS

Table of n, a(n) for n=1..65.

EXAMPLE

1^2+1 = 2 which is divided by A002313(1) which adds 1 to the sequence.

2^2+1 = 5 is divided by A002313(2) which adds 2 to the sequence.

27^2+1 = 730 is divided by A002313(10) which adds 27 to the sequence.

CROSSREFS

Sequence in context: A338459 A343035 A002314 * A362707 A094471 A362418

Adjacent sequences: A177976 A177977 A177978 * A177980 A177981 A177982

KEYWORD

easy,nonn

AUTHOR

Eva-Maria Zschorn (e-m.zschorn(AT)zaschendorf.km3.de), May 16 2010

EXTENSIONS

Disentangled variables in the definition - R. J. Mathar, Jun 07 2010

STATUS

approved