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A164322 Numbers n such that n=prime(P)+sigma(P), where P is product of digits of n. 2
14, 67673, 25688777 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
The product of the digits of next term (if it exists) is greater than 2*10^8.
LINKS
EXAMPLE
25688777=prime(2*5*6*8*8*7*7*7)+sigma(2*5*6*8*8*7*7*7), so 25688777 is in the
sequence.
MATHEMATICA
Do[If[n=Prime[m]+DivisorSigma[1, m]; m==Apply[Times, IntegerDigits[n]], Print[n]],
{m, 200000000}]
CROSSREFS
Sequence in context: A344668 A013754 A073940 * A372084 A159430 A013800
KEYWORD
base,more,nonn,bref
AUTHOR
Farideh Firoozbakht, Aug 13 2009
STATUS
approved

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Last modified June 21 01:33 EDT 2024. Contains 373535 sequences. (Running on oeis4.)