A325175 Numbers k such that s(k) = s(k+1) = s(k+2) = s(k+3) where s(k) is the sum of divisors of k that are smaller than sqrt(k) (A070039).

2, 1190499411, 7896840789, 9190223334, 10546199943, 13239147654, 16488284454, 19818736503, 19927041063, 20401914903, 20551875063, 24219563814, 25442242503, 27391724583, 34539825543, 35714513463, 37014168183, 44120613543, 44130940614, 44514172134, 48647900639

Offset

1,1

Comments

Five consecutive coincident values of A070039 are also possible. One such occurrence starts a 211301122224870.

Links

Table of n, a(n) for n=1..21.

Example

2 is in the sequence since A070039(2) = A070039(3) = A070039(4) = A070039(5) = 1.

Crossrefs

Cf. A070039, A324295, A324310.

Sequence in context: A170999 A249482 A214600 * A306499 A051241 A094486

Adjacent sequences: A325172 A325173 A325174 * A325176 A325177 A325178

Keyword

nonn

Author

Giovanni Resta, Sep 05 2019

Status

approved