A243902 Number of pairs of terms of the sequence A237929 less than 10^n.

2, 3, 4, 9, 18, 45, 146, 469, 1655, 6095, 23775

Offset

1,1

Links

Table of n, a(n) for n=1..11.

Giovanni Resta, eRAPs, the 446139 terms < 10^12.

Carlos Rivera, Extension to Ruth Aaron pairs

Crossrefs

Cf. A001414, A006145 Ruth-Aaron numbers (1): sum of prime divisors of n = sum of prime divisors of n+1, A228126 Sum of prime divisors of n (with repetition) is one less than the sum of prime divisors (with repetition) of n+1, A237929 Numbers n such that (i) the sum of prime divisors of n (with repetition) is one less than the sum of prime divisors (with repetition) of n+1, and (ii) n and n+1 have the same number of prime divisors (with repetition).

Sequence in context: A322783 A014281 A220364 * A086865 A258274 A228126

Adjacent sequences: A243899 A243900 A243901 * A243903 A243904 A243905

Keyword

nonn,hard,more

Author

Abhiram R Devesh, Jun 14 2014

Status

approved