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The digits of pi(n)=A000720(n) are obtained by adding pairs of adjacent digits of n.
2

%I #2 Mar 30 2012 17:40:36

%S 15,27,226,227,334,441,2107,3132,5172,10231,40203,50136

%N The digits of pi(n)=A000720(n) are obtained by adding pairs of adjacent digits of n.

%e 50136 belongs, since pi(50136)=5149 and (5+0)=5, (0+1)=1, (1+3)=4 and

%e (3+6)=9.

%Y Cf. A000720, A115999.

%K nonn,base,fini,more

%O 1,1

%A _Giovanni Resta_, Feb 13 2006