OFFSET
1,2
EXAMPLE
62481=T(353) and 18426 is the 111th pentagonal number.
PROG
(PARI) lista(nn) = {for(n=1, nn, t = n*(n+1)/2; if (ispolygonal(subst(Polrev(digits(t)), x, 10), 5), print1(n*(n+1)/2, ", ")); ); } \\ Michel Marcus, Apr 16 2014
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Jan 31 2006
EXTENSIONS
a(19)-a(24) from Michel Marcus, Apr 16 2014
STATUS
approved