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A015914 Numbers n such that sigma(n) + 6 = sigma(n + 6). 7
5, 7, 11, 13, 17, 23, 31, 37, 41, 47, 53, 61, 67, 73, 83, 97, 101, 103, 104, 107, 131, 147, 151, 157, 167, 173, 191, 193, 223, 227, 233, 251, 257, 263, 271, 277, 307, 311, 331, 347, 353, 367, 373, 383, 433, 443, 457, 461, 503, 541, 557, 563, 571 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

See A054903 for nonprimes. [Reinhard Zumkeller, Jan 27 2009]

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..1000

MATHEMATICA

Select[Range[50000], DivisorSigma[1, #] + 6==DivisorSigma[1, # + 6] &] (* Vincenzo Librandi, Mar 10 2014 *)

CROSSREFS

Sequence in context: A180951 A040146 A243593 * A023201 A106059 A102386

Adjacent sequences:  A015911 A015912 A015913 * A015915 A015916 A015917

KEYWORD

nonn

AUTHOR

Robert G. Wilson v

STATUS

approved

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Last modified February 27 15:59 EST 2020. Contains 332307 sequences. (Running on oeis4.)