A202273 Positive integers m in increasing order determined by these rules: a(1) = 1, for n>=1, if m is in the sequence then also are numbers h such that sigma(h) = 3m.

1, 2, 5, 8, 14, 15, 20, 23, 24, 26, 30, 38, 40, 41, 45, 46, 51, 54, 55, 56, 58, 59, 60, 71, 74, 78, 87, 88, 89, 90, 92, 95, 106, 113, 118, 123, 136, 137, 143, 145, 146, 153, 167, 173, 178, 179, 215, 233, 263, 269, 303, 317, 335, 353

Offset

1,2

Comments

Sequence is finite with 54 terms.

Links

Table of n, a(n) for n=1..54.

Example

m=1, 3m=3, sigma(h)=3 for h=2; number 2 is in sequence.
m=2, 3m=6, sigma(h)=6 for h=5; number 5 is in sequence.
m=5, 3m=15, sigma(h)=15 for h=8; number 8 is in sequence.
m=8, 3m=24, sigma(h)=24 for h=14,15,23; numbers 14,15,23 are in sequence.

Crossrefs

Cf. A000203, A002191, A202274.

Sequence in context: A009238 A009203 A363734 * A210702 A173177 A191109

Adjacent sequences: A202270 A202271 A202272 * A202274 A202275 A202276

Keyword

nonn,fini,full

Author

Jaroslav Krizek, Dec 25 2011

Status

approved