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A137601 a(n) is the smallest number m such that pi(m)+sigma(m)=n*m. 0
1, 2, 3902496 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Next term is greater than 135*10^7.
a(4) > 4*10^12. - Giovanni Resta, Apr 09 2017
LINKS
EXAMPLE
a(3)=3902496 because pi(3902496)+sigma(3902496)=3*3902496 and 3902496 is the smallest such number.
CROSSREFS
Sequence in context: A214599 A071066 A337368 * A232962 A158347 A273354
KEYWORD
hard,more,nonn,less,bref
AUTHOR
Farideh Firoozbakht, Apr 11 2008
STATUS
approved

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Last modified July 21 00:10 EDT 2024. Contains 374461 sequences. (Running on oeis4.)