A239290 Number of pairs of terms of the sequence A228126 less than 10^n.

4, 7, 8, 19, 55, 149, 497, 1799, 6696, 26109, 106953

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.

Sequence in context: A007285 A225430 A295325 * A057464 A344781 A160629

Adjacent sequences: A239287 A239288 A239289 * A239291 A239292 A239293

Keyword

nonn,hard,more

Author

Abhiram R Devesh, Jun 14 2014

Status

approved