A332456 Numbers k such that sigma(sigma(k)) is congruent to 6 modulo 8.

9, 67, 163, 193, 201, 202, 271, 338, 469, 489, 505, 547, 579, 606, 670, 673, 729, 813, 982, 1087, 1111, 1123, 1139, 1141, 1153, 1201, 1223, 1351, 1354, 1407, 1414, 1423, 1474, 1515, 1543, 1601, 1630, 1641, 1642, 1791, 1873, 1897, 1930, 1966, 2010, 2017, 2019, 2077, 2083, 2088, 2323, 2326, 2371, 2447, 2455, 2467, 2503

Offset

1,1

Links

Antti Karttunen, Table of n, a(n) for n = 1..10000

Index entries for sequences related to sigma(n)

Prog

(PARI) isA332456(n) = (6==(sigma(sigma(n))%8));

Crossrefs

Cf. A000203, A051027, A332226, A332457, A332458.

Sequence in context: A232018 A231199 A354532 * A255877 A197277 A238317

Adjacent sequences: A332453 A332454 A332455 * A332457 A332458 A332459

Keyword

nonn

Author

Antti Karttunen, Feb 15 2020

Status

approved