A038400 List of pairs of consecutive numbers each with 6 divisors (duplicates removed).

44, 45, 75, 76, 98, 99, 116, 117, 147, 148, 171, 172, 242, 243, 244, 245, 332, 333, 387, 388, 507, 508, 548, 549, 603, 604, 605, 724, 725, 844, 845, 908, 909, 931, 932, 963, 964, 1075, 1076, 1083, 1084, 1251, 1252, 1324, 1325, 1412, 1413, 1467, 1468, 1556, 1557, 1587, 1588

Offset

1,1

References

David Wells, The Penguin Dictionary of Curious and Interesting Numbers, Penguin Books, p. 103.

Links

Harvey P. Dale, Table of n, a(n) for n = 1..3000

Mathematica

SequencePosition[DivisorSigma[0, Range[1600]], {6, 6}]//Flatten//Union (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Aug 23 2017 *)

Crossrefs

Cf. A049103, A049104.

Sequence in context: A354145 A242934 A369276 * A364657 A254750 A225619

Adjacent sequences: A038397 A038398 A038399 * A038401 A038402 A038403

Keyword

nonn

Author

Felice Russo

Extensions

More terms from Olivier Gérard

Status

approved