OFFSET
1,1
LINKS
David A. Corneth, Table of n, a(n) for n = 1..160
David A. Corneth, PARI program
EXAMPLE
a(2) = 308 = 17^2 + 17 + 2 = 7 * 4 * (7 + 4) = 102 * 2 + 102 + 2.
PROG
(Python 2)
TOP = 100000000
a = [0]*TOP
c = []
for y in range(2, TOP/2):
if 2**y + 2 + y >= TOP: break
for x in range(2, TOP/2):
k = x**y+(x+y)
if k>=TOP: break
c.append(k)
for y in range(2, TOP/2):
if 2*y*y*y >= TOP: break
for x in range(y, TOP/2):
k = x*y*(x+y)
if k>=TOP: break
a[k]=1
for y in range(2, TOP/2):
if y*(y+2) >= TOP: break
for x in range(y, TOP/2):
k = x*y+(x+y)
if k>=TOP: break
a[k]|=2
if a[k]==3 and (k in c): print k,
print [n for n in range(TOP) if a[n]==3 and (n in c)]
(PARI) \\ See Corneth link
CROSSREFS
KEYWORD
nonn,changed
AUTHOR
Alex Ratushnyak, Mar 07 2015
EXTENSIONS
More terms from David A. Corneth, Oct 18 2024
STATUS
approved