A036922 Even composite numbers whose digit sum equals the digit sum of (sum of prime factors, counted with multiplicity).

4, 22, 94, 114, 150, 166, 202, 204, 222, 224, 274, 342, 346, 382, 438, 450, 454, 526, 540, 562, 612, 634, 640, 706, 852, 922, 1068, 1086, 1120, 1122, 1138, 1200, 1230, 1232, 1282, 1314, 1318, 1400, 1626, 1642, 1770, 1820, 1822, 1894, 1966, 2070, 2080

Offset: 1

Author

Patrick De Geest, Jan 04 1999

Keywords

• nonn
• base

Crossrefs

Cf. A006753, A036920, A019506.

Programs

PARI

isok(n)=my(f=factor(n)); n%2==0 && n>2 && sumdigits(sum(i=1, #f~, f[i,1]*f[i,2])) == sumdigits(n) \\ Andrew Howroyd, Jun 19 2021

Extensions

Title reworded by Sean A. Irvine, Nov 30 2020