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A020700 Sum of n plus its prime factors = sum of n+1 plus its prime factors. 1
7, 14, 63, 80, 224, 285, 351, 363, 475, 860, 902, 1088, 1479, 2013, 2023, 3478, 3689, 3925, 5984, 6715, 8493, 9456, 13224, 15520, 17227, 18569, 19502, 20490, 21804, 24435, 24476, 27335, 31899, 32390, 35815, 37406, 37582, 41876, 49468, 50609, 54137, 57239 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..42.

EXAMPLE

A075254(7) = 7+7 = 14 and A075254(8) = 8+2+2+2 = 14, so 7 is in the sequence.

PROG

(PARI) A075254(n) = my(f = factor(n)); n + sum(i=1, #f~, f[i, 1]*f[i, 2]);

isok(n) = A075254(n) == A075254(n+1); \\ Michel Marcus, Jun 05 2014

CROSSREFS

Cf. A020905.

Sequence in context: A033650 A135536 A241201 * A110496 A117867 A196254

Adjacent sequences:  A020697 A020698 A020699 * A020701 A020702 A020703

KEYWORD

easy,nonn

AUTHOR

Enoch Haga

EXTENSIONS

More terms from Michel Marcus, Jun 05 2014

STATUS

approved

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Last modified March 28 12:08 EDT 2017. Contains 284186 sequences.