The On-Line Encyclopedia of Integer Sequences (OEIS)

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A163647

The count of primes between the (2n-1)-st and (2n)-th amicable number.
(history; published version)

#7 by Alois P. Heinz at Sun Jul 28 08:35:56 EDT 2019

STATUS

editing

approved

#6 by Alois P. Heinz at Sun Jul 28 08:35:53 EDT 2019

CROSSREFS

Cf. A000040, A063990, A163653.

STATUS

proposed

editing

#5 by Hauke Löffler at Sun Jul 28 08:32:13 EDT 2019

STATUS

editing

proposed

#4 by Hauke Löffler at Sun Jul 28 08:31:49 EDT 2019

CROSSREFS

Cf. A000040, A063990.

STATUS

approved

editing

Discussion

Sun Jul 28

08:32

Hauke Löffler: Added crossref to A000040 (primes).

#3 by Russ Cox at Fri Mar 30 18:52:34 EDT 2012

AUTHOR

_Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), _, Aug 02 2009

Discussion

Fri Mar 30

18:52

OEIS Server: https://oeis.org/edit/global/257

#2 by Russ Cox at Fri Mar 30 17:40:06 EDT 2012

EXTENSIONS

a(4) corrected and sequence extended - _R. J. Mathar (mathar(AT)strw.leidenuniv.nl), _, Aug 07 2009

Discussion

Fri Mar 30

17:40

OEIS Server: https://oeis.org/edit/global/190

#1 by N. J. A. Sloane at Tue Jun 01 03:00:00 EDT 2010

NAME

The count of primes between the (2n-1)-st and (2n)-th amicable number.

DATA

14, 3, 42, 62, 19, 9, 241, 121, 348, 9, 138, 320, 84, 1870, 66, 1331, 58, 1268, 362, 384, 937, 81, 2220, 2910, 1911, 2358, 1359, 1306, 888, 264, 728, 845, 708, 119, 379, 1022, 982, 4471, 1351, 3375, 1234, 2486, 1911, 179, 750, 6482, 412, 831, 2386, 1810

OFFSET

1,1

COMMENTS

The number of terms in the n-th row of A163653.

EXAMPLE

a(2)=3 counts the 3 primes 1187, 1193, 1201 between 1184 and 1210.

CROSSREFS

Cf. A063990.

KEYWORD

nonn

AUTHOR

Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Aug 02 2009

EXTENSIONS

a(4) corrected and sequence extended - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 07 2009

STATUS

approved