A195900 - OEIS

A195900

Numbers n for which sigma(n) = 2 mod 4 and omega(sigma(n)/2) < omega(n).

10, 34, 52, 90, 106, 306, 388, 468, 490, 810, 850, 954, 976, 1300, 1525, 1666, 1690, 2650, 2754, 2890, 3033, 3050, 3492, 3610, 3626, 4194, 4212, 4410, 5194, 5200, 5746, 6066, 6100, 6292, 6516, 6800, 7290, 7650, 8586, 8746, 8784, 9610, 9700

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..43.

Terry Trotter, Smith's problem [Warning: As of March 2018 this site appears to have been hacked. Proceed with great caution. The original content should be retrieved from the Wayback machine and added here. - N. J. A. Sloane, Mar 29 2018]

PROG

(PARI) for(n=1, 1e6, s=sigma(n); if(s%4==2&&omega(s/2)<omega(n), print1(n", "))) \\ Charles R Greathouse IV, Sep 27 2011

CROSSREFS

Subsequence of A191217.

Sequence in context: A045087 A324746 A119086 * A322412 A247129 A002601

Adjacent sequences: A195897 A195898 A195899 * A195901 A195902 A195903

KEYWORD

nonn,base

AUTHOR

Kausthub Gudipati, Sep 25 2011

STATUS

approved