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

Author

Felice Russo

Keywords

• nonn

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

Crossrefs

Cf. A049103, A049104.

Programs

Mathematica

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

Extensions

More terms from Olivier Gérard