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A063680 Solutions to sigma(n)+7 = sigma(n+7). 2
74, 531434, 387420482 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

No other solutions < 4,290,000,000. Sequence A063679 shows how to generate more solutions, but there may be solutions other than those produced by A063679.

LINKS

Table of n, a(n) for n=1..3.

EXAMPLE

sigma(74)+7 = 121 = sigma(74+7), so 74 is in the sequence.

CROSSREFS

Cf. A000203, A063679, A015913-A015917, A054905.

Sequence in context: A145695 A116132 A257534 * A277841 A220472 A033395

Adjacent sequences:  A063677 A063678 A063679 * A063681 A063682 A063683

KEYWORD

nonn,bref

AUTHOR

Jud McCranie, Jul 28 2001

STATUS

approved

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Last modified May 11 06:28 EDT 2021. Contains 343784 sequences. (Running on oeis4.)