1,2

Intersection of A007377 and A008839. - Lekraj Beedassy (blekraj(AT)yahoo.com), Jul 27 2004

Leroy C. Dalton & Henry D. Snyder, Topics for Mathematics Clubs, pp. 68-69, NCTM Reston VA 1983.

J. S. Madachy, Madachy's Mathematical Recreation, "#2. Number Toughies", pp. 126-8, Dover NY 1979.

C. S. Ogilvy and J. T. Anderson, Excursions in Number Theory. Oxford Univ. Press, 1966, p. 89.

W. Schneider, NoZeros

Sequence in context: A048319 A037405 A048333 this_sequence A108942 A082274 A029804

Adjacent sequences: A007493 A007494 A007495 this_sequence A007497 A007498 A007499

fini,nonn,full

njas, Robert G. Wilson v (rgwv(AT)rgwv.com)