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A235812 a(n) is the start of the earliest run of n numbers such that the sum of their digits is equal to the sum of the digits of their prime factors. 0
2, 2, 2, 2, 1458855, 1790478, 429990136, 4475873320, 1979414080360 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
This sequence takes into account both primes and Smith numbers (A006753).
a(10) > 5*10^12.
LINKS
EXAMPLE
The four numbers 2, 3, 4, 5 are either prime (2, 3, 5) or Smith (4) numbers. In any case, the sum of their digits is equal to the sum of their prime factors (counted with multiplicity), hence a(1) = a(2) = a(3) = a(4) = 2.
CROSSREFS
Sequence in context: A339017 A084957 A239944 * A343471 A035307 A292373
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Jan 16 2014
STATUS
approved

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Last modified March 29 05:48 EDT 2024. Contains 371265 sequences. (Running on oeis4.)